WO2007126071A1 - 磁性薄膜及びそれを用いた磁気抵抗効果素子並びに磁気デバイス - Google Patents
磁性薄膜及びそれを用いた磁気抵抗効果素子並びに磁気デバイス Download PDFInfo
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- WO2007126071A1 WO2007126071A1 PCT/JP2007/059226 JP2007059226W WO2007126071A1 WO 2007126071 A1 WO2007126071 A1 WO 2007126071A1 JP 2007059226 W JP2007059226 W JP 2007059226W WO 2007126071 A1 WO2007126071 A1 WO 2007126071A1
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/33—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only
- G11B5/39—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects
- G11B5/3903—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects using magnetic thin film layers or their effects, the films being part of integrated structures
- G11B5/3906—Details related to the use of magnetic thin film layers or to their effects
- G11B5/3909—Arrangements using a magnetic tunnel junction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y25/00—Nanomagnetism, e.g. magnetoimpedance, anisotropic magnetoresistance, giant magnetoresistance or tunneling magnetoresistance
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/07—Alloys based on nickel or cobalt based on cobalt
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B23/00—Single-crystal growth by condensing evaporated or sublimed materials
- C30B23/02—Epitaxial-layer growth
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/52—Alloys
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
- G01R33/09—Magnetoresistive devices
- G01R33/093—Magnetoresistive devices using multilayer structures, e.g. giant magnetoresistance sensors
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/33—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only
- G11B5/39—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects
- G11B5/3903—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects using magnetic thin film layers or their effects, the films being part of integrated structures
- G11B5/3906—Details related to the use of magnetic thin film layers or to their effects
- G11B5/3929—Disposition of magnetic thin films not used for directly coupling magnetic flux from the track to the MR film or for shielding
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/02—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements
- G11C11/16—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements using elements in which the storage effect is based on magnetic spin effect
- G11C11/161—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements using elements in which the storage effect is based on magnetic spin effect details concerning the memory cell structure, e.g. the layers of the ferromagnetic memory cell
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F10/00—Thin magnetic films, e.g. of one-domain structure
- H01F10/08—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers
- H01F10/10—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers characterised by the composition
- H01F10/18—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers characterised by the composition being compounds
- H01F10/193—Magnetic semiconductor compounds
- H01F10/1936—Half-metallic, e.g. epitaxial CrO2 or NiMnSb films
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F10/00—Thin magnetic films, e.g. of one-domain structure
- H01F10/32—Spin-exchange-coupled multilayers, e.g. nanostructured superlattices
- H01F10/324—Exchange coupling of magnetic film pairs via a very thin non-magnetic spacer, e.g. by exchange with conduction electrons of the spacer
- H01F10/3254—Exchange coupling of magnetic film pairs via a very thin non-magnetic spacer, e.g. by exchange with conduction electrons of the spacer the spacer being semiconducting or insulating, e.g. for spin tunnel junction [STJ]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F10/00—Thin magnetic films, e.g. of one-domain structure
- H01F10/32—Spin-exchange-coupled multilayers, e.g. nanostructured superlattices
- H01F10/324—Exchange coupling of magnetic film pairs via a very thin non-magnetic spacer, e.g. by exchange with conduction electrons of the spacer
- H01F10/3268—Exchange coupling of magnetic film pairs via a very thin non-magnetic spacer, e.g. by exchange with conduction electrons of the spacer the exchange coupling being asymmetric, e.g. by use of additional pinning, by using antiferromagnetic or ferromagnetic coupling interface, i.e. so-called spin-valve [SV] structure, e.g. NiFe/Cu/NiFe/FeMn
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N50/00—Galvanomagnetic devices
- H10N50/80—Constructional details
- H10N50/85—Magnetic active materials
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/33—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only
- G11B5/39—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects
- G11B2005/3996—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects large or giant magnetoresistive effects [GMR], e.g. as generated in spin-valve [SV] devices
Definitions
- the present invention relates to a spin polarizability of 1, a magnetic thin film, a magnetoresistive effect element using the same, and a magnetic device.
- the giant magnetoresistive effect element includes a giant magnetoresistive effect element with a CIP (Current In Plane) structure that allows current to flow in the film plane, and a CPP (Current Perpendicular to the Plane) that allows current to flow in the direction perpendicular to the film surface.
- CIP Current In Plane
- CPP Current Perpendicular to the Plane
- a giant magnetoresistive element with a structure is known.
- the principle of the giant magnetoresistive element is also the contribution of spin-dependent scattering (Balter scattering) in a magnetic material to the spin-dependent scattering at the interface between the magnetic and nonmagnetic layers.
- the giant magnetoresistive element with the CPP structure which is expected to contribute to the nodal scattering, has a larger GMR than the giant magnetoresistive element with the CIP structure.
- Such a giant magnetoresistive effect element uses a spin valve type in which an antiferromagnetic layer is brought close to one of the ferromagnetic layers to fix the spin of the ferromagnetic layer.
- the antiferromagnetic layer has a specific resistance of about 200 ⁇ 'cm, which is about two orders of magnitude larger than that of a GMR film.
- the magnetoresistive value of a giant magnetoresistive element with a CPP structure is as small as 1% or less.
- TMR tunnel magnetoresistance
- the spin polarizability P of the ferromagnet takes a value of 0 ⁇ P ⁇ 1.
- the maximum value of TMR is about 60% when CoFeB alloy is used.
- MTJ elements are currently in practical use for magnetic heads for hard disks, and are expected to be applied to nonvolatile random access magnetic memories (MRAM) in the future!
- MRAM nonvolatile random access magnetic memories
- MTJ elements are arranged in a matrix, and by applying a magnetic field by applying a current to a separate wiring, the two magnetic layers that make up each MTJ element are controlled in parallel and antiparallel to each other. , "1" and "0" are recorded. Reading is performed using the TMR effect.
- MRAM if the element size is reduced to increase the density, noise due to element variation increases, and the TMR value is insufficient at present. Therefore, it is necessary to develop a device exhibiting a larger TMR.
- Half-Heusler alloys such as nSb, and L2 such as Co MnGe, Co MnSi, and Co CrAl
- a full Heusler alloy with a 2 2 2 1 structure is known as a half metal.
- these Heusler alloys containing Mn are difficult to obtain a stable TMR as soon as they are oxidized at the interface.
- the junction resistance is large because it is easily oxidized, and the product of resistance and area (RA) is usually 10 7 ⁇ ⁇ / zm 2 or more. If the resistance is too high, it will be difficult to apply to large-capacity MRAM.
- the present inventors have manufactured MTJ elements using various full-Heusler alloys so far, but when using Co FeAl full-Heusler alloy thin films prepared on MgO substrates,
- Non-Patent Document 2 Reported that a TMR of 50% or more can be obtained stably (see Non-Patent Document 2).
- the structure of Co FeAl at this time is not L2, but B2 with an irregular structure.
- L2 structure can be obtained even in thin films where it is easy to obtain L2 structure with Balta.
- Non-Patent Document 3 the present inventors have reported that a tunnel junction using this material does not provide a large TMR that is expected to be a half metal force with room temperature TMR as low as about 40%. It was.
- Non-patent literature 1 T. Miyazaki and N. Tezuka, Spin polarized tunneling in ferromagnet / insulator / ferromagnet junctions ", J. Magn. Magn. Mater, L39, p.1231, 1995
- Non-patent literature 2 Okamura et al., Appl. Phys. Lett., Vol.86, pp.232503- 1-232503- 3, 2
- Non-Patent Document 3 Inomata et al., J. Phys. D, Vol.39, pp.816-823, 2006
- the present invention provides a high spin polarizability magnetic thin film and a TMR element or GMR using the same, which can stably obtain a TMR larger than that of conventional FeCo alloys and FeCoB alloys at room temperature.
- a magnetoresistive element such as an element and a magnetic device
- a magnetic device such as a magnetic head and a magnetic recording apparatus.
- the present inventors prepared a Co Fe (Si Al) (where 0 ⁇ x ⁇ 1) thin film and used this film.
- the magnetic thin film of the present invention comprises a substrate and CoFe (
- the Co Fe (Si Al) thin film has an L2 or B2 structure and is 0
- X is 1.
- the substrate is thermally oxidized Si, glass, MgO single crystal, GaAs single crystal, A1
- any one of O single crystals may be used.
- a buffer layer may be provided, and the buffer layer may be at least one of Cr, Ta, V, Nb, Ru, Fe, FeCo alloy, and full Heusler alloy.
- a tunnel magnetoresistive element of the present invention includes a substrate, a ferromagnetic layer serving as a free layer, an insulating layer serving as a tunnel layer, and a ferromagnetic layer serving as a pinned layer. Either is the substrate Co Fe (Si Al) with L2 or B2 structure formed on it, where 0 ⁇ x ⁇ 1)
- the Co Fe (Si Al) (where 0 ⁇ ⁇ 1) magnetic thin film may be used as a free layer
- a buffer layer is provided, and at least one of Cr, Ta, V, Nb, Ru, Fe, FeCo alloy, and full Heusler alloy can be used as the buffer layer.
- the giant magnetoresistive element of the present invention includes a substrate, a ferromagnetic layer serving as a free layer, a nonmagnetic metal layer, and a ferromagnetic layer serving as a pinned layer. Consists of a Co Fe (Si Al) (where 0 ⁇ x ⁇ 1) magnetic thin film having an L2 or B2 structure formed on a substrate,
- Co Fe (Si Al) (where 0 ⁇ ⁇ 1) magnetic thin film may be used as the free layer
- a buffer layer is provided, and at least one of Cr, Ta, V, Nb, Ru, Fe, FeCo alloy, and full Heusler alloy can be used as the buffer layer.
- the magnetic device of the present invention has a substrate and an L2 or B2 structure formed on the substrate.
- the magnetic device further includes a tunnel magnetoresistive effect element or a giant magnetoresistive effect element having a ferromagnetic layer serving as a free layer, and the free layer is formed on a substrate by Co Fe (Si Al) ( Where 0 ⁇ x ⁇ 1) magnetic thin film.
- Substrate is thermally oxidized Si, glass
- It may be one of MgO, MgO single crystal, GaAs single crystal, and AlO single crystal. Board and C
- a noffer layer is disposed between the thin films.
- This buffer layer is made of Cr, Ta, V, Nb, Ru, Fe, FeCo alloy, full Heusler. At least one of the alloys can be used.
- the magnetic device of the present invention has a substrate and an L2 or B2 structure formed on the substrate.
- the magnetic device further includes a tunnel magnetoresistive effect element or a giant magnetoresistive effect element having a ferromagnetic layer serving as a free layer, and the free layer is formed on a substrate.
- a tunnel magnetoresistive effect element or a giant magnetoresistive effect element having a ferromagnetic layer serving as a free layer and the free layer is formed on a substrate.
- the substrate thermal oxidation Si,
- any one of glass, MgO single crystal, GaAs single crystal, and Al O single crystal can be used.
- a buffer is provided between the substrate and the Co Fe (Si Al) (where 0 ⁇ x ⁇ 1) thin film.
- the buffer layer can be made of at least one of Cr, Ta, V, Nb, Ru, Fe, FeCo alloy, and full Heusler alloy.
- the magnetic device includes a magnetic head, a magnetic recording device using the magnetic head, an MRAM, and a hard disk drive.
- a magnetic head having a large capacity and a high speed can be obtained by using a magnetoresistive element having a large TMR or GMR at a low current and a low external magnetic field at room temperature.
- Various magnetic devices such as a magnetic recording device can be provided.
- a magnetic thin film using AO (here, 0 x x 1) exhibits ferromagnetic properties and a large spin polarizability.
- CoFe (SiAl) (where 0 ⁇ x ⁇ 1) magnetic thin film having the L2 or B2 structure of the present invention
- a very large GMR can be obtained at room temperature with a low current and a low external magnetic field.
- a very large TMR can be obtained with a tunnel magnetoresistive element.
- CoFe (SiAl) (where 0 ⁇ x ⁇ 1) magnetic thin film having the L2 or B2 structure of the present invention
- various magnetoresistive effect elements using a magnetic head By applying various magnetoresistive effect elements using a magnetic head to various magnetic devices such as magnetic heads of ultra-high-capacity HDDs and non-volatile MRAMs that operate at high speeds, they are compact and high-performance. Can be realized. It can also be applied as a spin-injection element, and since the saturation magnetization is small and the spin polarizability is large, the magnetic domain reversal current due to spin injection is small, and magnetic domain reversal can be realized with low power consumption. Efficient spin injection becomes possible, and spin FETs may be developed. It can be used as a key material for broadly developing the spin electronics field.
- FIG. 1 is a cross-sectional view of a magnetic thin film according to a first embodiment of the present invention.
- FIG. 2 is a cross-sectional view of a modified example of the magnetic thin film according to the first embodiment.
- FIG. 3 Co Fe (Si Al) used in the magnetic thin film according to the first embodiment (where 0 ⁇ x ⁇ 1
- FIG. 4 is a view showing a cross section of a magnetoresistive effect element using a magnetic thin film according to a second embodiment.
- FIG. 5 is a view showing a cross section of a modification of the magnetoresistive effect element using the magnetic thin film according to the second embodiment.
- FIG. 6 is a view showing a cross section of a modification of the magnetoresistive effect element using the magnetic thin film according to the second embodiment.
- FIG. 7 is a view showing a cross section of a magnetoresistive effect element using a magnetic thin film according to a third embodiment.
- FIG. 8 is a view showing a cross section of a modification of the magnetoresistive effect element using the magnetic thin film according to the third embodiment.
- FIG. 9 is a diagram showing the results of X-ray diffraction measurement of the Co 2 Fe (Si 2 Al 3) thin film of Example 1.
- FIG. 10 is a view showing the results of X-ray diffraction measurement of the Co Fe (Si Al) thin film of Example 2.
- FIG. 11 is a graph showing the temperature dependence of the magnetic properties of the Co 2 Fe (Si 3 Al 4) thin film of Example 2.
- FIG. 12 is a diagram showing the magnetic field dependence of the resistance at room temperature of the tunnel magnetoresistive effect element of Example 3.
- FIG. 13 is a diagram showing the temperature magnetic field dependence of TMR in the tunnel magnetoresistive effect element of Example 3.
- FIG. 14 is a graph showing the composition dependence of TMR Co Fe (Si Al) thin film at room temperature in the tunnel magnetoresistive effect elements of Examples 3 to 8 and Comparative Examples 1 and 2.
- FIG. 15 is a graph showing the dependence of room temperature TMR and junction resistance on the MgO layer thickness in the tunnel magnetoresistive effect element of Example 12.
- MgO layer thickness is 1.7 nm and Co Fe (Si Al) thin film heat treatment temperature is 430 ° C
- FIG. 11 is a diagram showing the temperature dependence of TMR in the tunnel magnetoresistive effect element of Example 12 taken.
- FIG. 17 is a diagram showing the magnetic field dependence of resistance at 5 K of the tunnel magnetoresistive effect element in FIG.
- FIG. 18 is a view showing the heat treatment temperature dependence of TMR in the tunnel magnetoresistive element of Example 12.
- FIG. 19 is a graph showing the heat treatment temperature dependence of the junction resistance in the tunnel magnetoresistive element of Example 12.
- FIG. 1 is a sectional view of a magnetic thin film according to the first embodiment of the present invention. As shown in FIG. 1, the magnetic thin film 1 of the present invention has a Co Fe (Si), platinum, and others.
- the composition X is zO ⁇ x ⁇ 1.
- the Co Fe (Si Al) thin x x 2 1-x x film 3 is ferromagnetic at room temperature.
- the thickness of the Co Fe (Si Al) thin film 3 on the substrate 2 is less than lnm.
- FIG. 2 is a cross-sectional view of a modification of the magnetic thin film according to the first embodiment of the present invention.
- the magnetic thin film 5 of the present invention has the same structure as that of the magnetic thin film 1 shown in FIG. 1, and further includes a substrate 2 and a Co Fe (Si Al) (where 0 ⁇ x ⁇ 1) thin film 3. Buffer layer 4 is inserted into
- the crystallinity of the thin film 3 can be further improved and the surface roughness can be reduced.
- the substrate 2 used for the magnetic thin films 1 and 5 is thermally oxidized Si, polycrystalline such as glass, MgO, Al
- a single crystal such as O or GaAs can be used.
- the buffer layer 4 Cr, V, Nb, Ta
- the Co Fe (Si Al) (where 0 ⁇ x ⁇ 1) thin film 3 has a film thickness of lnm or more and 1 ⁇ m or less
- the film thickness exceeds 1 m, application as a spin device becomes difficult, which is not preferable.
- FIG. 3 shows the Co Fe (Si Al) (here, the magnetic thin film used in the first embodiment of the present invention).
- bcc body-centered cubic lattice
- Si and A1 are Si
- Fe and S are located at positions I and II in Fig. 3, respectively.
- composition ratio of Si and A1 is Si Al (where
- the Co Fe (Si Al) (where 0 ⁇ x ⁇ 1) thin film 3 having the above configuration is ferromagnetic at room temperature.
- Co 2 Fe 3 (Si 2 Al 2) (where 0 ⁇ x ⁇ 1) thin film 3 having an L2 or B2 structure is obtained.
- the thin film 3 is heat treated to obtain an L2 or B2 structure depending on the temperature.
- composition X of the Co Fe (Si Al) thin film 3 is set to 0 ⁇ ⁇ 1 when X is 0 or 1.
- the B2 structure of the Co Fe (Si Al) (where 0 ⁇ x ⁇ 1) thin film is similar to the L2 structure.
- the B2 structure is an irregular arrangement. These differences can be measured by X-ray diffraction.
- FIG. 4 is a view showing a cross section of a magnetoresistive effect element using a magnetic thin film according to a second embodiment of the present invention.
- the magnetoresistive effect element using the magnetic thin film of the present invention is a tunnel magnetoresistive effect element.
- the tunnel magnetoresistive element 10 includes, for example, a Co Fe (Si Al) (where 0 ⁇ x ⁇ 1) thin film 3 is disposed on a substrate 2.
- the insulating layer 11, the ferromagnetic layer 12, and the antiferromagnetic layer 13 to be the tunnel layer are sequentially stacked.
- the antiferromagnetic layer 13 is used for a so-called spin valve type structure that fixes the spin of the ferromagnetic layer 12.
- Co Fe (Si Al) (where 0 ⁇ x
- the thin film 3 is called the free layer, and the ferromagnetic layer 12 is called the pinned layer.
- the ferromagnetic layer 12 can have a single-layer structure or a multi-layer structure.
- the insulating layer 11 has an oxide of Al O and A1, A
- the ferromagnetic layer 3 ⁇ 4 layer is made of CoFe, NiFe, CoFeB, or CoFe and NiFe.
- IrMn can be used for the antiferromagnetic layer 13.
- a nonmagnetic electrode layer 14 serving as a protective film is further deposited on the antiferromagnetic layer 13 in the tunnel magnetoresistive effect element 10 of the present invention.
- FIG. 5 is a view showing a cross section of a modification of the magnetoresistive element using the magnetic thin film according to the second embodiment of the present invention.
- the tunnel magnetoresistive effect element 15, which is a magnetoresistive effect element using the magnetic thin film of the present invention, has a buffer layer 4 and a Co Fe (Si Al) (
- FIG. 5 differs from the structure of FIG. 4 in that a buffer layer 4 is further provided in the structure of FIG. The other structure is the same as FIG.
- FIG. 6 is a view showing a cross section of a modified example of the magnetoresistive effect element using the magnetic thin film according to the second embodiment of the present invention.
- a tunnel magnetoresistive effect element 20 that is a magnetoresistive effect element using the magnetic thin film of the present invention has a buffer layer 4 and a Co Fe (Si Al) (
- the thin film 3 is disposed, and the insulating layer 11 which becomes the tunnel layer, and Co Fe (Si Al)
- FIG. 6 differs from the structure of FIG. 5 in that the ferromagnetic layer 12 serving as the pinned layer of FIG. 4 is also made of Co Fe (Si Al) (where 0 ⁇ x ⁇ 1) thin film, which is the magnetic thin film of the present invention.
- the pinned ferromagnetic layer 16 is composed of Co Fe (Si Al) (where 0 ⁇ x ⁇ 1) thin film and CoF
- a multilayer film made of a ferromagnetic layer such as e may be used.
- the external magnetic field is applied in parallel to the film surface.
- the current flowing through the buffer layer 4 and the electrode layer 14 can be a CPP structure in which current flows in the direction perpendicular to the film surface.
- the substrate 2 used for the tunnel magnetoresistive effect elements 10, 15, and 20 may be a polycrystalline such as thermally oxidized Si or glass, or a single crystal such as MgO, Al 2 O, or GaAs. Also, the back
- At least one of Cr, Ta, V, Nb, Ru, Fe, FeCo alloy, and full Heusler alloy can be used as the layer 4.
- the film thickness may be from 1 nm to 1 ⁇ m. If this film thickness is less than lnm, it is substantially L2
- the tunnel magnetoresistive effect elements 10, 15, and 20 of the present invention having the above-described configuration are formed by a normal thin film forming method such as a sputtering method, a vapor deposition method, a laser ablation method, and an MBE method, and an electrode having a predetermined shape. It can be manufactured using a mask process or the like for forming.
- tunnel magnetoresistive effect elements 10 and 15 which are magnetoresistive effect elements using the magnetic thin film of the present invention will be described.
- the magnetoresistive effect elements 10 and 15 using the magnetic thin film of the present invention use two ferromagnetic layers 3 and 12, one of which is adjacent to the antiferromagnetic layer 13 and the adjacent ferromagnetic layer 12 (pinned layer).
- a free layer of Co Fe (Si Al) (where 0 ⁇ x ⁇ 1) thin film is used when an external magnetic field is applied. 3 spins
- the ferromagnetic layer is Co Fe (Si Al) (here
- the spin polarizability is as high as 0.5 or more at room temperature. Therefore, the TMR of the tunnel magnetoresistive elements 10 and 15 of the present invention is very large. Become. At this time, the free layer of Co Fe (Si Al) (where 0 x x 1)
- the magnetic field reversal can be caused by a small demagnetizing field.
- the tunnel magnetoresistive effect elements 10 and 15 of the present invention are suitable for magnetic devices such as MRAM that require magnetic field reversal at low power.
- tunnel magnetoresistive element 20 which is a magnetoresistive element using the magnetic thin film of the present invention.
- the tunnel magnetoresistive element 20 is also the same as the ferromagnetic layer 16 of the pinned layer, which is also a free layer, which is ferromagnetic and has a large spin polarizability, where Co Fe (Si Al) (where 0 ⁇ x ⁇ 1) thin film 3 Co F
- the tunnel magnetoresistive element 20 of the invention is suitable for a magnetic device that requires a large TMR such as MRAM.
- FIG. 7 is a view showing a cross section of a magnetoresistive effect element using a magnetic thin film according to a third embodiment of the present invention.
- the magnetoresistive effect element using the magnetic thin film of the present invention shows a case of a giant magnetoresistive effect element.
- the giant magnetoresistive effect element 30 is formed on the substrate 2 with the CoFe (Si Al) (where 0 0 0
- the thin film 3 is disposed as a free layer, and a nonmagnetic metal layer 21, a ferromagnetic layer 22 serving as a pinned layer, and a nonmagnetic electrode layer 14 serving as a protective film are sequentially stacked.
- a voltage is applied between the noffer layer 4 and the electrode layer 14 of the giant magnetoresistive effect element.
- the external magnetic field is applied in parallel to the film surface.
- the current flow to the noffer layer 4 and the electrode layer 14 can be a CIP structure in which current flows in the film surface and a CPP structure in which current flows in the direction perpendicular to the film surface.
- FIG. 8 is a view showing a cross section of a modified example of the magnetoresistive effect element using the magnetic thin film according to the third embodiment of the present invention.
- the giant magnetoresistive effect element 35 of the present invention is different from the giant magnetoresistive effect element 30 of FIG. 7 in that an antiferromagnetic layer 13 is provided between the ferromagnetic layer 22 and the electrode layer 14 to provide a spin noreb type giant This is a magnetoresistive effect element.
- the other structures are the same as those in FIG.
- the antiferromagnetic layer 13 functions to fix the spins of the ferromagnetic layer 22 that becomes the adjacent pinned layer.
- a voltage is applied between the buffer layer 4 and the electrode layer 14 of the giant magnetoresistive elements 30 and 35.
- An external magnetic field is applied in parallel to the film surface.
- the current flowing through the buffer layer 4 and the electrode layer 14 can be a CIP structure in which current flows in the film surface and a CPP structure in which current flows in the direction perpendicular to the film surface.
- a polycrystalline material such as thermally oxidized Si or glass, or a single crystal such as MgO, Al 2 O 3 or GaAs can be used.
- Buffer layer 4 a polycrystalline material such as thermally oxidized Si or glass, or a single crystal such as MgO, Al 2 O 3 or GaAs can be used.
- At least one of Cr, Ta, V, Nb, Ru, Fe, FeCo alloy, and full Heusler alloy can be used.
- Use non-magnetic metal layer 21 such as Cu, Al, Cr Can do.
- the ferromagnetic layer 22 may be CoFe, NiFe, Co Fe (Si Al) (where 0 ⁇ x
- any one of thin films or a composite film made of these materials can be used.
- IrMn, PtMn or the like can be used.
- Thin film 3 has a thickness of lnm or more and 1 ⁇ m or less
- this film thickness is less than lnm, it is difficult to obtain an L2 or B2 structure substantially.
- the giant magnetoresistive effect elements 30 and 35 of the present invention having the above-described structure are formed by a normal thin film deposition method such as sputtering, vapor deposition, laser ablation, MBE, and a mask for forming electrodes having a predetermined shape. It can be manufactured using a process or the like.
- film 3 is a half metal, Co Fe (Si Al) (where 0 ⁇ x ⁇ 1) only one spin of thin film 3 contributes to conduction when an external magnetic field is applied. So very
- the giant magnetoresistive element 35 which is a magnetoresistive element using the magnetic thin film of the present invention, will be described.
- the spin-valve giant magnetoresistive element 35 since the spin-valve giant magnetoresistive element 35 is used, the spin of the ferromagnetic layer 22 that is the pinned layer is fixed by the antiferromagnetic layer 13 and is free by application of an external magnetic field.
- Co Fe (Si Al) (where 0 ⁇ x
- the CPP operation of the giant magnetoresistive elements 30, 35 which are magnetoresistive elements using the magnetic thin film of the present invention, will be described.
- a giant magnetoresistive element with a CPP structure the specific resistance of Co Fe (Si Al) (where 0 ⁇ ⁇ 1) and that of the antiferromagnetic layer 13
- various magnetoresistive elements using the magnetic thin film of the present invention have a very large TMR or GMR at a low current and a low magnetic field at room temperature.
- the magnetoresistive change rate is obtained by the following equation (2). This value is larger! /, And the desired magnetoresistive change rate is U.
- the magnetoresistive effect element using the magnetic thin film of the present invention has a magnetic field slightly larger than zero.
- a magnetic field that is, a low magnetic field
- a large magnetoresistance change rate can be obtained.
- the magnetoresistive effect element using the magnetic thin film of the present invention exhibits a large TMR or GMR at a low current and a low magnetic field at room temperature, high sensitivity can be obtained when used as a magnetoresistive sensor.
- the tunnel magnetoresistive element or giant magnetoresistive element using the magnetic thin film of the present invention can be applied to various magnetic devices.
- an MTJ element as a magnetoresistive effect element using the magnetic thin film of the present invention can be used in various magnetic apparatuses such as an MRAM.
- MRAM magnetic random access memory
- MTJ elements are arranged in a matrix, and an external magnetic field is applied by passing a current through a separate wiring. “1” and “0” can be recorded by controlling the magnetic field of the ferromagnetic material of the free layer composing the MTJ element to be parallel and antiparallel to each other by an external magnetic field.
- reading can be performed using the TMR effect.
- the element area can be reduced, so that a large capacity of a magnetic device such as a hard disk drive (HDD) or MRAM can be obtained.
- the magnetic device is used in a concept including a magnetic head, various magnetic recording devices using the magnetic head, the MRAM, a hard disk drive, and the like.
- Example 1 [0055] Examples of the present invention will be described below.
- a CoFe (Si Al) thin film 3 having a thickness of lOOnm was formed on an MgO (001) substrate 2 at room temperature using a high frequency magnetron sputtering apparatus. Then heat treatment at temperatures up to 600 ° C
- FIG. 9 shows the results of measuring the X-ray diffraction of the Co Fe (Si Al) thin film 3 of Example 1.
- the vertical axis represents the X-ray diffraction intensity (arbitrary scale), and the horizontal axis represents the angle (°), that is, an angle corresponding to twice the incident angle ⁇ of the X-ray to the atomic plane.
- Figure 9 shows Co Fe (Si Al
- Co Fe (Si Al) thin film 3 has (001) orientation.
- the film has been epitaxially grown on the MgO substrate 2 by rotating 45 ° in the film plane.
- FIG. 9 shows the Co Fe (Si Al) thin film 3 formed at room temperature and then at 500 ° C and 600 ° C.
- a CoFe (SiAl) thin film 3 having a thickness of lOOnm was produced at room temperature in the same manner as in Example 1 except that the buffer layer 4 made of Cr was used. Then heat treatment at temperatures up to 600 ° C.
- FIG. 10 shows the result of measuring the X-ray diffraction of the Co 2 Fe (Si 2 Al 3) thin film 3 of Example 2.
- Figure 10 shows the Co Fe (Si Al) thin film 3 deposited at room temperature.
- FIG. 10 shows that after forming the Co Fe (Si Al) thin film 3 at room temperature
- the X-ray diffraction pattern of the sample heat-treated at 500 ° C is shown.
- FIG. 11 shows the temperature dependence of the magnetization of the Co 2 Fe (Si 3 Al 4) thin film 3 of Example 2.
- the vertical axis represents magnetization (emuZcm 3 ) and the horizontal axis represents temperature (K).
- the values of the magnetization of Si Al) thin film 3 near the He temperature and 300K are about 1090emu, respectively.
- FIG. 11 shows the magnetic field curve of the Co Fe (Si Al) thin film 3 of Example 2 at room temperature.
- the vertical axis represents the magnetic field (emuZcm 3 ), and the horizontal axis represents the applied magnetic field H (Oe).
- the CoFe (Si Al) thin film 3 of Example 2 has a low coercive force.
- V showing soft magnetism
- Example 3 a spin valve type tunnel magnetoresistive element (MTJ) 15 shown in FIG. 5 was produced.
- MTJ tunnel magnetoresistive element
- a buffer layer 4 made of is formed on the MgO (001) substrate 2 and Co Fe (Si which becomes a ferromagnetic free layer on the buffer layer 4 is formed.
- the heat-treated Co Fe (Si Al) thin film 3 had a B2 structure
- the AlOx layer that becomes the tunnel insulating layer 11 is 1.2 nm
- the CoFe layer that becomes the ferromagnetic pinned layer 12 is 3 nm
- the IrMn that becomes the antiferromagnetic material 13 that serves to fix the spin of the CoFe layer layer 10 nm
- a Ta layer 5 nm as an electrode layer 14 that plays the role of a protective film and the role of a mask in microfabrication were sequentially laminated.
- heat treatment was performed in a magnetic field at a temperature of 250 ° C. Specifically, a uniaxial anisotropy was introduced into the film surface by applying a magnetic field of 2 kOe.
- the laminated film formed as described above was finely processed using photolithography and ion milling to produce a spin valve type tunnel magnetoresistive effect element 15 having a dimension of 10 m ⁇ 10 m.
- FIG. 12 shows the magnetic field dependence of resistance at room temperature of the tunnel magnetoresistive effect element 15 of Example 3.
- the horizontal axis in the figure is the external magnetic field H (Oe)
- the left vertical axis is the resistance ( ⁇ )
- the right vertical axis is the TMR (%) calculated from the measured resistance force.
- the solid and dotted lines in the figure indicate the resistance values when the external magnetic field is swept. This gave a 75% TMR at room temperature. This TMR value is larger than that when using conventional CoFe and CoFeB alloys.
- FIG. 13 is a graph showing the temperature magnetic field dependence of TMR in the tunnel magnetoresistive effect element 15 of Example 3.
- the horizontal axis in the figure is temperature (K), and the vertical axis is TMR (%).
- K temperature
- TMR %
- composition x of Co Fe (Si Al) that forms the ferromagnetic free layer 3 is 0.1, and the Co Fe (Si Al) thin
- a tunnel magnetoresistive element 15 of Example 4 was fabricated in the same manner as Example 3 except that the film was 2 1-x x 2 0.1 0.9.
- the TMR at room temperature was approximately 63%.
- composition x of Co Fe (Si Al) for forming the ferromagnetic free layer 3 is 0.3, and the Co Fe (Si Al) thin
- Example 5 The tunnel magnetoresistive effect element 15 of Example 5 was changed in the same manner as Example 3 except that the film was changed. Produced. The TMR at room temperature was approximately 70%.
- composition x of Co Fe (Si Al) that forms the ferromagnetic free layer 3 is 0.6, and the Co Fe (Si Al) thin
- a tunnel magnetoresistive effect element 15 of Example 6 was fabricated in the same manner as Example 3 except that the film was 2 1-x x 2 0.6 0.4.
- the TMR at room temperature was approximately 80%.
- composition x of Co Fe (Si Al) that forms the ferromagnetic free layer 3 is set to 0.7, and the Co Fe (Si Al) thin film
- a tunnel magnetoresistive effect element 15 of Example 7 was fabricated in the same manner as Example 3 except that the film was 2 1-x x 2 0.7 0.3.
- the TMR at room temperature was approximately 77%.
- composition x of Co Fe (Si Al) that forms the ferromagnetic free layer 3 is set to 0.9, and the Co Fe (Si Al) thin film
- a tunnel magnetoresistive element 15 of Example 8 was fabricated in the same manner as Example 3 except that the film was 2 1-x x 2 0.7 0.3.
- the TMR at room temperature was approximately 69%.
- composition x of Co Fe (Si Al) that forms the ferromagnetic free layer 3 is 0, that is, a Co FeSi thin film.
- a tunnel magnetoresistive element of Comparative Example 1 was produced in the same manner as Example 3 except that.
- the TMR at room temperature was about 41%.
- composition x of Co Fe (Si Al) that forms the ferromagnetic free layer 3 is 1, that is, a Co FeAl thin film.
- a tunnel magnetoresistive element of Comparative Example 2 was produced in the same manner as Example 3 except that.
- the TMR at room temperature was approximately 53%.
- FIG. 14 is a graph showing the composition dependence of TMR Co Fe (Si Al) thin film at room temperature in the tunnel magnetoresistive effect elements of Examples 3 to 8 and Comparative Examples 1 and 2.
- the horizontal axis in the figure is the pair
- Co FeSi comparative example 1 and composition X of 1 show Co FeAl comparative example 2.
- a large TMR of 80% was obtained, and the Heusler alloy according to the present invention showed a TMR of more than 60%, indicating that it has a large spin polarizability.
- the TMR at room temperature in the anti-effect element was about 41% and 53%, respectively, and both of the Fe Fe (Si Al) (where 0 ⁇ x ⁇ 1) thin film 3 of Examples 3 to 8 were used. Tunnel magnetoresistance effect used
- a spin-valve type tunnel magnetoresistive element (MTJ) 20 was manufactured.
- a buffer layer 4 composed of 40 nm was formed on an MgO (OOl) substrate 2 using a high-frequency magnetron sputtering apparatus.
- Co Fe which becomes a ferromagnetic free layer on the Cr buffer layer 4)
- Si Al layer 3 is 30 nm
- MgO layer to be tunnel insulating layer 11 is 2 nm
- Co Fe (Si Al) layer 3 is 30 nm
- MgO layer to be tunnel insulating layer 11 is 2 nm
- Co Fe (Si Al) layer 3 is 30 nm
- MgO layer to be tunnel insulating layer 11 is 2 nm
- Co Fe (Si Al) layer 3 is 30 nm
- MgO layer to be tunnel insulating layer 11 is 2 nm
- Co Fe (Si Al) layer 3 is 30 nm
- MgO layer to be tunnel insulating layer 11 is 2 nm
- Co Fe (Si Al) layer 3 is 30 nm
- MgO layer to be tunnel insulating layer 11 is 2 nm
- Co Fe (Si Al) layer 3 is 30 nm
- MgO layer to be tunnel insulating layer 11 is 2 nm
- Co Fe (Si Al) layer 3 is 30 nm
- Heat treated Co Fe (Si Al) thin film 3 is B2
- the CoFe layer that becomes the ferromagnetic pinned layer 16 has a thickness of 3 nm
- the IrMn layer that becomes the antiferromagnetic material 13 that fixes the spin of the pinned layer 16 has a thickness of 10 nm
- Ta layer 5 nm as electrode layer 14 which also plays a role was sequentially laminated.
- heat treatment in a magnetic field at a temperature of 500 ° C. is performed to cool to room temperature, and the CoFe (Si Al) layer and the CoFe
- the laminated film formed as described above was finely processed using photolithography and ion milling to produce a spin-valve type tunnel magnetoresistive element 20 having dimensions of 10 m ⁇ 10 m.
- Example 10 a giant magnetoresistive effect element 35 (CPP-GMR element) having a CPP structure with a spin valve type shown in FIG. 8 was produced.
- CPP-GMR element giant magnetoresistive effect element 35
- Co Fe (Si Al) thin film 3 has an L2 structure.
- the Cu layer to be the nonmagnetic metal layer 21 is 3 nm
- the CoFe layer to be the ferromagnetic pinned layer 22 is 3 nm
- the IrMn layer to be the antiferromagnetic material 13 that fixes the spin of the CoFe layer 22 is 1 Onm.
- a Ta layer 5 nm serving as an electrode layer 14 that also serves as a protective film and a mask in microfabrication was sequentially laminated.
- a magnetic field of 2 kOe was applied at a temperature of 250 ° C. to perform heat treatment in the magnetic field, and uniaxial anisotropy was introduced into the film surface of the CoFe layer that becomes the pinned layer 22.
- the laminated film formed as described above was finely applied using photolithography and ion milling to produce a spin valve type CPP type giant magnetoresistive effect element 35 having dimensions of 10 m ⁇ 10 m.
- the specific resistance of the Co Fe (Si Al) thin film 3 is about 19
- a giant magnetoresistive element 35 having the CPP structure of the spin valve type of Example 11 was produced in the same manner as Example 10 except that the force was also changed to various values between 1.
- the CPP — GMR at room temperature is 3% or more in all cases, which is much larger than that of the giant magnetoresistive effect element having a spin valve type CPP structure using a conventional alloy as a ferromagnetic free layer. It was.
- Example 12 a spin valve type tunnel magnetoresistive element (MTJ) 20 was produced in the same manner as Example 9.
- a buffer layer 4 composed of 40 nm is formed on the MgO (OOl) substrate 2 and Co Fe (which becomes a ferromagnetic free layer on the Cr buffer layer 4).
- Si Al layer 3 is 30 nm, and the MgO layer that becomes the tunnel insulating layer 11 and the Co Fe (Si Al) layer
- the heat-treated Co Fe (Si Al) thin film 3 had a B2 structure.
- the CoFe layer that becomes the ferromagnetic pinned layer 16 is 3 nm
- the IrMn layer that becomes the antiferromagnetic material 13 that fixes the spin of the pinned layer 16 is 10 nm
- the role of the protective film and the role of the mask in microfabrication Ta layer 2 nm as an electrode layer 14 that fulfills the above conditions was laminated in order.
- the laminated film formed as described above was finely processed using photolithography and ion milling to produce a spin-valve type tunnel magnetoresistive element 20 having dimensions of 10 m ⁇ 10 m.
- Example 12 is different from the spin-valve type tunnel magnetoresistive element 20 of Example 9 in that the film thickness of the MgO layer that becomes the tunnel insulating layer 11 is changed and the Co that becomes the ferromagnetic free layer is changed.
- the heat treatment temperature of Fe (Si Al) layer 3 was changed from 275 ° C to 525 ° C at approximately 25 ° C intervals.
- FIG. 15 shows the film thickness dependence of the room temperature TMR and the junction resistance of the MgO layer 11 in the tunnel magnetoresistive element 20 of Example 12.
- the horizontal axis of the figure is the thickness of MgO layer 11 (nm), left The vertical axis is TMR (%), and the right vertical axis is the junction resistance (Q ⁇ m 2 ).
- the white circle ( ⁇ ) plot shows CoFe (Si Al
- the TMRs of effect element 20 are 70%, 210%, 175%, 113%, and 108%, respectively, and the largest TMR (210%) force S is obtained when the thickness of MgO layer 11 is 1.7 nm. I knew that. None of these TMR values were obtained when the Co Fe (Si Al) thin film 3 was heat-treated.
- the junction resistance of the tunnel magnetoresistive element 20 of Example 12 is that the thickness of the MgO layer 11 is 1.
- FIG. 16 shows the heat treatment temperature of the CoFe (Si Al) thin film 3 with the MgO layer 11 having a thickness of 1.7 nm.
- FIG. 10 is a graph showing the temperature dependence of TMR in the tunnel magnetoresistive effect element 20 of Example 12 in which the temperature is 430 ° C.
- FIG. The vertical axis in the figure is TMR (%), and the horizontal axis is the measured temperature (K).
- the TMR at room temperature is 220%
- the TMR increases as the temperature is lowered
- the TMR at the measurement temperature of 5K is very high at 390%.
- P 0.81.
- FIG. 17 shows the magnetic field dependence of the resistance at 5 K of the tunnel magnetoresistive element 20 of FIG.
- the horizontal axis in the figure is the external magnetic field H (Oe)
- the left vertical axis is the resistance ( ⁇ )
- the right vertical axis is the TMR (%) calculated from the measured resistance.
- the solid and dotted lines in the figure show the resistance values when the external magnetic field is swept. From this, 390% TMR was obtained at 5K. This TMR value was larger than that of the conventional TMR when CoFe alloy or CoFeB alloy was used.
- FIG. 18 shows the heat treatment temperature dependence of TMR in the tunnel magnetoresistive element 20 of Example 12.
- the vertical axis in the figure is the room temperature TMR (%), and the horizontal axis is the heat treatment temperature (° C).
- the plots of the square mark (country), black circle mark ( ⁇ ), and black triangle mark ( ⁇ ) indicate the values of the thickness of the MgO layer that becomes the tunnel insulating layer 11 being 1.5 nm, 2 nm, and 2.5 nm, respectively. .
- the TMR was about 45%.
- the heat treatment temperature of the Co Fe (Si Al) thin film 3 is
- the TMR for C is approximately 63%, approximately 70%, approximately 83%, approximately 92%, approximately 103%, approximately 123%, approximately 147%, approximately 172%, approximately 175%, and approximately 158%, respectively. It was. Co Fe (Si Al;) thin film 3
- the heat treatment temperature of the Co Fe (Si Al) thin film 3 is 2
- the TMR for C is approximately 30%, approximately 35%, approximately 45%, approximately 52%, approximately 58%, approximately 72%, approximately 90%, approximately 110%, approximately 110%, approximately 90%, respectively. It was. Thermal treatment of Co Fe (Si Al) thin film 3
- TMR when the heat treatment temperature is increased for any MgO layer 11, TMR increases and becomes maximum at different temperatures for each MgO layer 11 and decreases.
- the MgO layer 11 has a thickness of 1.5 nm, the TMR reaches its maximum at a heat treatment temperature of 375 ° C, and no heat treatment is performed until the heat treatment temperature reaches about 425 ° C! It can be seen that if the heat treatment is performed at a temperature of ° C or higher, the TMR will be lower than that without the heat treatment.
- the TMR becomes maximum at a heat treatment temperature of 500 ° C.
- TMR can be reduced from about 75% to 175% by heat treatment at 300 ° C. to 525 ° C.
- FIG. 19 shows the heat treatment temperature dependence of the junction resistance in the tunnel magnetoresistive element 20 of Example 12.
- the vertical axis represents the junction resistance (Q ⁇ m 2 )
- the horizontal axis represents the heat treatment temperature (° C).
- the black square mark (country), black circle mark ( ⁇ ), and black triangle mark ( ⁇ ) plots show the values of the thickness of the MgO layer that is the tunnel insulating layer 11 being 1.5 nm, 2 nm, and 2.5 nm, respectively. ing.
- the junction resistance is about 2 X 10 3 ⁇ ⁇ m 2 .
- the bonding resistance when the heat treatment temperature was 400 ° C, 425 ° C, 450 ° C is about 1. 5 X 10 3 ⁇ m 2 , the heat treatment temperature 475.
- the junction resistance for C was about 1 X 10 3 ⁇ m 2 .
- the heat treatment temperature of the Co Fe (Si Al) thin film 3 is
- the junction resistance when the heat treatment temperature is 425 ° C, 450 ° C, 475 ° C, 500 ° C, 525 ° C is about 6 ⁇ 10 4 ⁇ m 2 , 7 ⁇ 10 4 ⁇ m 2 , 8 ⁇ 10 4 ⁇ ⁇ m, respectively 2 , IX 10 5 ⁇ ⁇ m 2 , and it was found that the junction resistance increases with increasing temperature when the heat treatment temperature is 400 ° C or higher.
- the heat treatment temperature of the Co Fe (Si Al) thin film 3 is 2
- the junction resistance when the heat treatment temperature is 450 ° C, 475 ° C, 500 ° C, 525 ° C is about 2.5 2.10 7 ⁇ ⁇ , about 3X10 7 ⁇ ⁇ m 2 , about 3 10 7 0 111 2 , about 4X 10 7 ⁇ m 2, and the the case of the heat treatment temperature is 425 ° C or higher was the component of force to increase contact resistance with temperature rise.
- the tunnel magnetoresistive element In this case, the composition of the Co Fe (Si 8 1) thin film 3 (0 ⁇ 1) used as the free layer
- the thickness of the edge layer and the like can be appropriately designed so as to obtain a desired TMR, and these are also included in the scope of the present invention.
- the magnetic thin film and the magnetoresistive effect element and magnetic device using the magnetic thin film according to the present invention can obtain large TMR and GMR at a low magnetic field at room temperature, various electronic devices necessary for magnetic field detection and magnetic field reversal detection, As a magnetic field detection device for various industrial machines, it is suitable for use in a magnetic field detection device of medical electronic equipment.
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Abstract
Description
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Also Published As
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JP4582488B2 (ja) | 2010-11-17 |
US8125745B2 (en) | 2012-02-28 |
US20090097168A1 (en) | 2009-04-16 |
JPWO2007126071A1 (ja) | 2009-09-10 |
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