WO2016125200A1 - 垂直磁化型mtj素子の製造方法 - Google Patents
垂直磁化型mtj素子の製造方法 Download PDFInfo
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- WO2016125200A1 WO2016125200A1 PCT/JP2015/000446 JP2015000446W WO2016125200A1 WO 2016125200 A1 WO2016125200 A1 WO 2016125200A1 JP 2015000446 W JP2015000446 W JP 2015000446W WO 2016125200 A1 WO2016125200 A1 WO 2016125200A1
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 44
- 230000005415 magnetization Effects 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000000758 substrate Substances 0.000 claims abstract description 54
- 229910019236 CoFeB Inorganic materials 0.000 claims abstract description 36
- 238000005530 etching Methods 0.000 claims description 19
- 238000007689 inspection Methods 0.000 description 41
- 238000004544 sputter deposition Methods 0.000 description 25
- 238000010586 diagram Methods 0.000 description 12
- 238000012546 transfer Methods 0.000 description 9
- 238000012545 processing Methods 0.000 description 7
- 230000011218 segmentation Effects 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000001020 plasma etching Methods 0.000 description 6
- 238000001465 metallisation Methods 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000001312 dry etching Methods 0.000 description 3
- 238000010884 ion-beam technique Methods 0.000 description 3
- 239000013077 target material Substances 0.000 description 3
- 229910003321 CoFe Inorganic materials 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910018979 CoPt Inorganic materials 0.000 description 1
- 229910005335 FePt Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/82—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by variation of the magnetic field applied to the device
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- H—ELECTRICITY
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- H10N50/00—Galvanomagnetic devices
- H10N50/10—Magnetoresistive devices
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Definitions
- the present invention relates to a method for manufacturing a perpendicular magnetization type magnetic tunnel junction (MTJ: Magnetic Tunnel Junction) element.
- MTJ Magnetic Tunnel Junction
- STT-MRAM Spin Transfer Torque Magnetoresistive Random Access Memory
- a perpendicular magnetization type MTJ element whose magnetization direction is perpendicular to the film surface is used.
- Each layer constituting the perpendicular magnetization type MTJ element is very thin, and its characteristics are likely to deteriorate when exposed to the air during the film forming process. For this reason, in the technique of Non-Patent Document 1, all the steps are performed consistently in a vacuum in order to prevent the characteristic deterioration of the barrier layer and the perpendicular magnetic anisotropic layer.
- an object of the present invention is to provide a method for manufacturing a perpendicular magnetization type MTJ element that divides a step of inspecting MR characteristics and a step of inspecting perpendicular magnetic anisotropy characteristics. .
- One embodiment of the present invention is a method of manufacturing a perpendicular magnetization type MTJ element having a first stacked structure including a pair of CoFeB layers sandwiching an MgO layer and a second stacked structure including a stacked body, Forming one of the second stacked structures on the substrate, exposing the substrate on which one of the first and second stacked structures is formed to the atmosphere, and inspecting the characteristics of the substrate; And a step of forming the other of the first and second laminated structures on a substrate on which one of the first and second laminated structures is formed.
- the characteristic management of the perpendicular magnetization type MTJ element can be simplified. Specifically, the step of forming the laminated structure affecting the MR characteristics and the step of forming the laminated structure affecting the perpendicular magnetic anisotropy characteristics are divided, and the inspection process of the MR characteristics and the perpendicular magnetic anisotropy characteristics is performed. Since each process is performed separately, it is possible to easily identify which stack configuration has the cause when trouble such as failure to obtain desired characteristics occurs.
- First Embodiment 1A and 1B are schematic views showing a stacked structure of perpendicular magnetization type MTJ elements according to the first embodiment of the present invention.
- the thickness of each layer drawn on drawing does not suggest the relative thickness of each layer of the perpendicular magnetization type MTJ element actually manufactured, but is drawn roughly.
- Vertical magnetization type MTJ elements include a top-pin type vertical MTJ element 100A (FIG. 1A) and a bottom-pin type vertical MTJ element 100B (FIG. 1B).
- a top-pin type vertical MTJ element 100A shown in FIG. 1A will be described.
- a top-pin type vertical MTJ element 100A includes a lower electrode 102, a Ta layer (seed layer) 103, a CoFeB layer 104 as a free layer (magnetization free layer), and an MgO layer (tunnel barrier layer) 105 on a substrate 101 such as silicon. And a CoFeB layer 106 as a reference layer (magnetization fixed layer).
- the top-pin type vertical MTJ element 100A includes a Ta layer 107 on a CoFeB layer 106, [Co / Pt] stacks 110A and 110B having a superlattice structure, a Ru layer 115 (cap layer), a Ta layer 111, and The upper electrode 112 is provided in order.
- the [Co / Pt] stacks 110A and 110B are obtained by alternately stacking a predetermined number of Co layers and Pt layers, and the Ru layer 110C is formed by magnetizing the upper and lower [Co / Pt] stacks 110A and 110B. It is a layer for combining them.
- the number of alternating layers of the Co layer and the Pt layer of the [Co / Pt] stack 110A is 3 to 5, and the number of layers of the Co layer and the Pt layer of the [Co / Pt] stack 110B that are alternately stacked. Is 8-15 times.
- [Co / Pt] laminates 110A and 110B may be [Co / Pd] laminates using Pd layers instead of Pt layers.
- the thicknesses of the Ta layer 103, the CoFeB layer 104, the MgO layer 105, the CoFeB layer 106, the Ta layer 107, and the Ru layer 110C are, for example, 10 nm, 1.1 nm, 1 nm or less, 1.4 nm, and 0.3 nm, respectively. . *
- a bottom-pin type vertical MTJ element 100B shown in FIG. 1B includes each layer of the top-pin type vertical MTJ element 100A, but a CoFeB layer 106 as a reference layer (magnetization fixed layer) is disposed on the side far from the substrate 101. Accordingly, the stacked bodies 110 ⁇ / b> B and 110 ⁇ / b> A are provided between the substrate 101 and the CoFeB layer 106. Further, a Ru layer 116 as a seed layer is further included under the stacked body 110B, and the Ru layer 116 is a layer for improving the crystal orientation of the [Co / Pt] stacked body 110B.
- the [Co / Pt] stacked bodies 110A and 110B may be made of a material having perpendicular magnetization.
- the [Co / Pt] laminates 110A and 110B TbFeCo, [Co / Ni] laminates, ordered alloys such as CoPt and FePt may be used.
- the configuration of the perpendicular magnetization type MTJ element (Top-pin type and Bottom-pin type) according to the present embodiment is not limited to the configuration shown here, and the number of layers is increased or decreased within a range that does not impair the function of the perpendicular magnetization type MTJ element.
- the structure may be any change such as changing the constituent material of each layer or reversing the upper and lower stacking order.
- the first stacked structure 10 includes at least a CoFeB layer 104, an MgO layer 105, and a CoFeB layer 106
- the second stacked structure 20 includes at least [Co / Pt] stacked bodies 110A and 110B having a superlattice structure.
- the substrate on which the first stacked structure 10 is formed is taken out from the first film forming apparatus and is placed in the atmosphere. Expose and test its MR properties. Then, after performing an etch-back (Etchback) process in a vacuum in another second film forming apparatus, the second stacked structure 20 is further formed to form the Top-pin type vertical MTJ element 100A, and then the second structure. Remove from the film apparatus and inspect its perpendicular magnetic anisotropy characteristics.
- Etchback etch-back
- the lower electrode layer necessary for the inspection is formed on the substrate before the first stacked structure 10 is formed, and the substrate on which the first stacked structure 10 is further formed.
- the inspection is performed using a CIPT measuring device (CIPT: Current In-Plane Tunneling), etc., and the perpendicular magnetic anisotropy characteristic is inspected by a VSM measuring device (VSM: Vibrating Sample). Magnetometer) or the like.
- CIPT Current In-Plane Tunneling
- VSM Vibrating Sample
- Magnetometer Vibrating Sample
- the division of the perpendicular magnetization type MTJ element into the first stacked structure 10 and the second stacked structure 20 is performed based on the Ta layer 107 (also referred to as “SpacerTa”). If the first stacked structure 10 includes at least the CoFeB layer 104, the MgO layer 105, and the CoFeB layer 106, and the second stacked structure 20 includes at least the [Co / Pt] stacked bodies 110A and 110B having a superlattice structure, Another layer may be used as a reference for the division. As shown in FIG. 2A, it is preferable that the Ta layer 107 of the first stacked structure 10 is formed to be relatively thick on the assumption that it is removed by etching.
- the function of the perpendicular magnetization type MTJ element is exhibited. Is done.
- the thickness of the Ta layer 107 is formed in advance to about 3 nm and is controlled to 2 nm or less by etch back. However, the thickness to be etched back may be 1 nm or more.
- the thickness of the oxide film formed on the surface of the Ta layer 107 due to exposure to the atmosphere depends on the diffusion of oxygen into the Ta layer 107 that correlates with the time, temperature, etc. placed in the atmosphere. Therefore, since it is possible to empirically know how much oxide film is generated in the Ta layer 107 based on the inspection time of the characteristic inspection after processing by the first film forming apparatus, the environmental temperature, etc. It can be empirically known how much the Ta layer 107 should be removed in the back process.
- FIG. 2B after the step of etching a part of the Ta layer 107 (etch back step), it is formed from the Co layer of the [Co / Pt] stack 110A, and finally the Top-layer shown in FIG. 1A.
- a pin type vertical MTJ element 100A is formed.
- the substrate on which the first laminated structure 10 is formed up to the Ta layer 107 under vacuum is taken out from the first film forming apparatus, and the MR characteristics are inspected in a clean room under the atmosphere. I do.
- the substrate is introduced into the second film forming apparatus, and a part (oxidized part) of the Ta layer 107 is etched (etched back) under vacuum, and then the Co layer of the [Co / Pt] stacked body 110A.
- the upper layer is formed, and after the top electrode 112 is formed, it is taken out from the second film forming apparatus, and the perpendicular magnetic anisotropy characteristic is inspected.
- a part of the Ta layer 107 may be formed again from the Ta layer 107A after etching (etch back step). Note that the Ta layer 107 and the Ta layer 107A are formed using the same material and deposition conditions. Further, as shown in FIG. 2D, after the CoFeB layer 106 is formed to be relatively thick, the extraction characteristic inspection is performed from the first film forming apparatus, and the Ta layer 107 is etched after part of the CoFeB layer 106 is etched by the second film forming apparatus. You may form from.
- the manufacturing method of the Bottom-pin type vertical MTJ element 100B according to the present embodiment, after the part of the Bottom-pin type vertical MTJ element 100B related to the second stacked structure 21 is formed on the substrate, the characteristics are inspected. Thus, a portion related to the first stacked structure 11 of the Bottom-pin type vertical MTJ element 100B is further formed to perform characteristic inspection.
- the first stacked structure 11 includes at least a CoFeB layer 104, an MgO layer 105, and a CoFeB layer 106
- the second stacked structure 21 includes at least [Co / Pt] stacked bodies 110A and 110B having a superlattice structure.
- the Ta layer 107 of the second laminated structure 21 is formed relatively thick, and after the step of etching a part of the Ta layer 107 (etch back step) as shown in FIG. A bottom-pin type vertical MTJ element 100B shown in FIG. 1B is finally formed.
- the substrate on which the second laminated structure 21 is formed up to the Ta layer 107 is taken out from the first film forming apparatus, and is perpendicularly magnetized in a clean room under the atmosphere. Inspect anisotropic characteristics. Then, the substrate is introduced into the second film forming apparatus, and a part (oxidized part) of the Ta layer 107 is etched (etched back) under vacuum, and then the upper layer is formed from the CoFeB layer 106. Then, after forming up to the top electrode 112, it is taken out from the second film forming apparatus and inspected for MR characteristics.
- the Co layer which is the uppermost layer of the [Co / Pt] stacked body 110A of the second stacked structure 21, is formed to be relatively thick, and then taken out from the first film forming apparatus to perform a characteristic inspection.
- the Ta layer 107 may be formed after part of the Co layer is etched by the second film forming apparatus.
- FIG. 4 is a schematic configuration diagram of a manufacturing system 400 including single core sputtering apparatuses 410 and 420 as a first film forming apparatus and a second film forming apparatus used in the method for manufacturing a perpendicular magnetization type MTJ element according to the present embodiment. It is.
- the sputtering apparatus 410 is a first film forming apparatus that forms the first stacked structure 10
- the sputtering apparatus 420 is a second film forming that forms the second stacked structure 20.
- the sputtering apparatus 410 is a first film forming apparatus that forms the second stacked structure 21
- the sputtering apparatus 420 is a second film forming apparatus that forms the first stacked structure 11.
- the manufacturing system 400 also includes characteristic inspection apparatuses 430 and 440.
- the characteristic inspection apparatus 430 is a CIPT measuring instrument for inspecting MR characteristics
- the characteristic inspection apparatus 440 is a vertical inspection apparatus. It is a VSM measuring device for inspecting magnetic anisotropy characteristics.
- the characteristic inspection device 430 is a VSM measurement device
- the characteristic inspection device 440 is a CIPT measurement device. The following description relates to the manufacturing system 400 of the top-pin type vertical MTJ element 100A unless otherwise specified.
- the bottom-pin type vertical MTJ element 100B has a difference in the order of layers to be formed and the target material to be used. The same except for the differences.
- the sputtering apparatus 410 includes an EFEM (Equipment Front End Module) 411, a load lock chamber 412, a vacuum transfer chamber 413, an etching chamber 414, metal deposition chambers 415 to 417, an oxidation chamber 418, and a degassing chamber 419. Keep in vacuum.
- EFEM Equipment Front End Module
- the EFEM 411 carries the substrate into and out of the load lock chamber 412, and the load lock chamber 412 adjusts the room to a vacuum state and then sends the substrate to the vacuum transfer chamber 413.
- the vacuum transfer chamber 413 includes a robot loader for loading and unloading a substrate on a robot feeder (not shown) in each of the chambers 414 to 419.
- the etching chamber 414 performs dry etching processing such as capacitively coupled (CCP) plasma etching, inductively coupled (ICP) plasma etching, or ion beam etching on the substrate.
- target materials for forming each layer of the first stacked structure 10 for example, a Ta target, a CoFeB target, an Mg target, and the like are disposed, and each layer is formed on the substrate by a sputtering process.
- the oxidation chamber 418 performs an oxidation process on the substrate.
- the sputtering apparatus 420 includes an EFEM 421, a load lock chamber 422, a vacuum transfer chamber 423, an etching chamber 424, metal deposition chambers 425 to 428, and a degas chamber 429, and each chamber is kept in a vacuum.
- the EFEM 421, the load lock chamber 422, the vacuum transfer chamber 424, and the degas chamber 429 are the same as those of the sputtering apparatus 410.
- target materials for forming each layer of the second laminated structure 20, such as a Co target, a Pt target, a Ru target, and a Ta target are arranged, and each layer is formed on the substrate by a sputtering process. To do.
- the substrate is transferred between the sputtering apparatuses 410 and 420 and the characteristic inspection apparatuses 430 and 440 by a transfer path (not shown) or an operator.
- the substrate 101 is loaded into the load lock chamber 412 via the EFEM 411 of the first film forming apparatus 410 and the robot loader of the vacuum transfer chamber 413 is driven, whereby the substrate is loaded from the load lock chamber 412 to a predetermined substrate processing chamber 414.
- the substrate is loaded from the load lock chamber 412 to a predetermined substrate processing chamber 414.
- the first film forming apparatus 410 removes impurities and the like attached on the substrate 101 by etching, and then the lower electrode 102, the Ta layer 103, and the CoFe layer on the substrate 101. 104, the MgO layer 105, the CoFeB layer 1006 as a reference layer, and the Ta layer 107 are formed in this order by sputtering, and the first stacked structure 10 is formed.
- the first film forming apparatus 410 removes impurities and the like attached on the substrate 101 by etching, and then lower electrode 102, Ta layer 103, and stacked body 110A. , 110B are sequentially formed by a sputtering method, and the second stacked structure 21 is formed.
- the substrate is discharged from the first film forming apparatus 410 through the load lock chamber 412 and the EFEM 411 and exposed to the atmosphere, and the characteristic inspection apparatus 430 performs characteristic inspection (MR characteristic inspection or perpendicular magnetic anisotropy). Inspection of characteristics).
- the substrate is loaded into the load lock chamber 422 via the EFEM 421 of the second film forming apparatus 420 and the robot loader of the vacuum transfer chamber 423 is driven, whereby the substrate is loaded from the load lock chamber 422 to a predetermined substrate processing chamber 424-.
- the second stacked structure 20 (or the first stacked structure 11) is formed.
- the second film formation apparatus 420 removes the impurities attached to the Ta layer 107 and the oxide film formed on the Ta layer by etching, and then stacks 110A, The Ru layer 110C, the stacked body 110B, the Ru layer 115, the Ta layer 111, and the upper electrode 112 are sequentially formed by a sputtering process.
- the second film forming apparatus 420 removes the impurities attached to the Ta layer 107 and the oxide film formed on the Ta layer by the etching process, and then the CoFe layer.
- Top-pin type vertical MTJ element 100A (or Bottom-pin type vertical MTJ element 100B) is discharged from the second film forming apparatus 420 and then subjected to the perpendicular magnetic anisotropy characteristics in the characteristic inspection apparatus 440. (Or MR characteristics) is inspected.
- the MgO layer 105 may be formed by radio frequency (RF) sputtering using an MgO target, or after forming an Mg layer on a CoFeB layer by sputtering using an Mg target, the Mg layer You may form by performing an oxidation process with respect to. Further, the Mg film forming process and the oxidizing process may be performed in the same substrate processing chamber in the first film forming apparatus 410 (or the second film forming apparatus 420), and the metal deposition chamber and the oxidation chamber are used. May be performed in different substrate processing chambers.
- RF radio frequency
- a double core sputtering apparatus 500 as shown in FIG. 5 may be used as a film forming apparatus used in the method for manufacturing a perpendicular magnetization type MTJ element. Also in the double core sputtering apparatus 500, the manufacturing method of the perpendicular magnetization type MTJ element according to the present embodiment can be performed, and the number of chambers that can be subjected to film formation in one film forming apparatus is increased, so that compared with a single core sputtering apparatus. More perpendicular magnetization type MTJ elements can be manufactured.
- FIG. 6 is a flowchart for explaining a method of manufacturing the top-pin type vertical MTJ element 100A of the perpendicular magnetization type MTJ element according to this embodiment.
- the first stacked structure 10 is formed by sequentially forming the bottom electrode 102, the Ta layer 103, the CoFeB layer 104, the MgO layer 105, the CoFeB layer 106, and the Ta layer 107 on the substrate 101 in the first film forming apparatus 410. To do. As described above, the CoFeB layer 106 may be formed relatively thick, and the Ta layer 107 may be included in the second stacked structure 20 without including the Ta layer 107 in the first stacked structure 10.
- the substrate on which the first laminated structure 10 is formed is taken out from the first film forming apparatus 410 and exposed to the atmosphere to form an electrode layer and the like necessary for characteristic inspection.
- MR characteristic inspection is performed in characteristic inspection apparatus 430 which is a CIPT measuring instrument. Accordingly, since the characteristic inspection is performed on the substrate on which only the first laminated structure 10 before the second laminated structure 20 is formed, the management of the characteristics due to the first laminated structure 10 is facilitated. Can do.
- the uppermost layer (Ta layer 107 or CoFeB layer 106) of the first stacked structure 10 is naturally oxidized by exposure to the atmosphere, so the second film formation is performed.
- An etching process is performed in the apparatus 420.
- the etching process is dry etching using Ar gas, for example, capacitive coupling (CCP) plasma etching, inductive coupling (ICP) plasma etching, ion beam etching, or the like.
- the first layer 112A (the Ta layer 107 if necessary), the stacked body 110A, the Ru layer 110C, the stacked body 110B, the Ru layer 115, the Ta layer 111, and the top electrode 112 are formed.
- a two-layer structure 20 is formed. Since the characteristic inspection (MR characteristic) for the first laminated structure 10 has already been performed, after the second laminated structure 20 is formed, in the characteristic inspection apparatus 440 that is a VSM measuring device, a characteristic different from the MR characteristic is obtained in S606. That is, the perpendicular magnetic anisotropy characteristic is inspected.
- MR characteristic characteristic inspection
- FIG. 7 is a flowchart for explaining a manufacturing method of the bottom-pin type vertical MTJ element 100B of the perpendicular magnetization type MTJ element according to the present embodiment.
- the bottom electrode 102, the Ta layer 103, the Ru layer 106, the stacked body 110 ⁇ / b> B, the Ru layer 110 ⁇ / b> C, the stacked body 110 ⁇ / b> A, and the Ta layer 107 are sequentially formed on the substrate 101 in the first film forming apparatus 410.
- Structure 21 is formed.
- the uppermost Co layer of the stacked body 110A may be formed relatively thick so that the Ta layer 107 is not included in the second stacked structure 21 and the Ta layer 107 is included in the first stacked structure 11. .
- the substrate on which the second laminated structure 21 is formed is taken out from the first film forming apparatus 410 and exposed to the atmosphere to form an electrode layer and the like necessary for characteristic inspection.
- the perpendicular magnetic anisotropy characteristic is inspected in the characteristic inspection apparatus 430 which is a VSM measuring instrument.
- step S704 after the characteristic inspection of the second stacked structure 21 is completed, the uppermost layer (Ta layer 107 or Co layer) of the second stacked structure 21 is naturally oxidized by exposure to the atmosphere.
- Etching is performed at 420.
- the etching process is dry etching using Ar gas, for example, capacitive coupling (CCP) plasma etching, inductive coupling (ICP) plasma etching, ion beam etching, or the like.
- CCP capacitive coupling
- ICP inductive coupling
- the first stacked structure 11 is formed in the second film forming apparatus 420 by forming the Ta layer 107 (if necessary), the CoFeB layer 106, the MgO layer 105, the CoFeB layer 104, the Ta layer 111, and the top electrode 112. Form. Since the characteristic inspection (perpendicular magnetic anisotropy characteristic) has already been performed on the second laminated structure 21, after forming the first laminated structure 11, MR is performed in the characteristic inspection apparatus 440 that is a CIPT measuring instrument in S 706. A property check is performed.
- the MR characteristic is obtained at the stage of forming the first stacked structure including the CoFeB layer 104, the MgO layer 105, and the CoFeB layer 106.
- the perpendicular magnetic anisotropy characteristics can be inspected at the stage where the second stacked structure having the stacked bodies 110A and 110B is formed.
- a device formed by each device is formed between the device that forms the first stacked structure and the device that forms the second stacked structure.
- the perpendicular magnetic anisotropy characteristics are ensured, and even if a defect occurs in the film forming apparatus that forms the first stacked structure, the second A laminated structure can be formed.
- throughput can be improved by increasing the number of modules for substrate processing. For example, by using the double core sputtering apparatus 500 shown in FIG. 5, the throughput can be increased approximately twice as much as that of the single core sputtering apparatus 410 or 420 shown in FIG. 4.
- both the MR characteristic and the perpendicular magnetic anisotropy characteristic inspection are performed on the perpendicular magnetization type MTJ element in which both the first laminated structure and the second laminated structure are formed. Therefore, for example, when a deviation from the expected value occurs in the MR characteristics due to the first laminated structure, the perpendicular magnetic anisotropy characteristics due to the second laminated structure are normal even if the perpendicular magnetic anisotropy characteristics are normal. All the type MTJ elements had to be discarded, and the film forming process for forming the second stacked structure was wasted, resulting in production loss costs.
- the manufacturing method of the perpendicular magnetization type MTJ element according to the present invention is not limited to the production of the perpendicular magnetization type MTJ element having the configuration shown in FIGS. It is also applicable to. Further, by using the manufacturing method according to the present invention, it is possible to reduce the cost for adjusting the conditions of the film forming apparatus for the perpendicular magnetization type MTJ element having the desired characteristics.
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Abstract
Description
図1A及び1Bは、本発明の第1実施形態に係る垂直磁化型MTJ素子の積層構造を示す模式図である。なお、図面に描かれた各層の厚みは、実際に製造される垂直磁化型MTJ素子の各層の相対的な厚さを示唆するものではなく、あくまで概略的に描いている。
本発明に係る垂直磁化型MTJ素子の製造方法は、図1A及び1Bに示す構成を有する垂直磁化型MTJ素子の製造に限定されるものではなく、どのような種類の垂直磁化型MTJ素子の製造にも適用可能である。また、本発明に係る製造方法を用いることで、所期の特性を有する垂直磁化型MTJ素子の成膜装置の条件調整に係るコストを低減することができる。
11:第1積層構造
20:第2積層構造
21:第2積層構造
104:CoFeB層
105:MgO層
106:CoFeB層
107:Ta層
110A:積層体
110B:積層体
Claims (4)
- MgO層を挟む一対のCoFeB層を含む第1積層構造と、積層体を含む第2積層構造とを有する垂直磁化型MTJ素子の製造方法であって、
前記第1及び第2積層構造のうちの一方を基板上に形成する工程と、
前記第1及び第2積層構造のうちの前記一方が形成された基板を大気に暴露し、該基板の特性を検査する工程と、
前記第1及び第2積層構造のうちの前記一方が形成された基板上に、前記第1及び第2積層構造のうちの他方を形成する工程とを有することを特徴とする垂直磁化型MTJ素子の製造方法。 - 前記特性を検査する工程の後であって前記他方を形成する工程の前に、前記第1及び第2積層構造のうちの前記一方の最上層の一部をエッチング処理する工程をさらに有することを特徴とする請求項1に記載の製造方法。
- 前記最上層は、前記第1積層構造に含まれるTa層又は前記CoFeB層であることを特徴とする請求項2に記載の製造方法。
- 前記最上層は、前記第2積層構造に含まれるTa層又は前記積層体のCo層であることを特徴とする請求項2に記載の製造方法。
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