WO2007119708A1 - 磁気ランダムアクセスメモリ - Google Patents
磁気ランダムアクセスメモリ Download PDFInfo
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- WO2007119708A1 WO2007119708A1 PCT/JP2007/057839 JP2007057839W WO2007119708A1 WO 2007119708 A1 WO2007119708 A1 WO 2007119708A1 JP 2007057839 W JP2007057839 W JP 2007057839W WO 2007119708 A1 WO2007119708 A1 WO 2007119708A1
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
- H01L23/367—Cooling facilitated by shape of device
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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
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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
-
- 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
- G11C11/165—Auxiliary circuits
- G11C11/1659—Cell access
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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
- G11C11/165—Auxiliary circuits
- G11C11/1675—Writing or programming circuits or methods
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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
- H10N50/10—Magnetoresistive devices
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/10—Bump connectors; Manufacturing methods related thereto
- H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
- H01L2224/16—Structure, shape, material or disposition of the bump connectors after the connecting process of an individual bump connector
- H01L2224/161—Disposition
- H01L2224/16151—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/16221—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/16225—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L2224/31—Structure, shape, material or disposition of the layer connectors after the connecting process
- H01L2224/32—Structure, shape, material or disposition of the layer connectors after the connecting process of an individual layer connector
- H01L2224/321—Disposition
- H01L2224/32151—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/32221—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/32225—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/73—Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
- H01L2224/732—Location after the connecting process
- H01L2224/73201—Location after the connecting process on the same surface
- H01L2224/73203—Bump and layer connectors
- H01L2224/73204—Bump and layer connectors the bump connector being embedded into the layer connector
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B61/00—Magnetic memory devices, e.g. magnetoresistive RAM [MRAM] devices
Definitions
- the present invention relates to an MRAM (Magnetic Random Access Memory), and more particularly to an MRAM that writes data by inverting a magnetic field using a spin-polarized current.
- MRAM Magnetic Random Access Memory
- spin Spin injection magnetization reversal method
- spin spin injection magnetization reversal method
- the required current increases as the size of the memory cell decreases.
- the spin injection magnetization reversal method the required current decreases as the size of the memory cell decreases. Therefore, the spin transfer magnetization reversal method is considered to be a powerful method for realizing a large-capacity MRAM.
- Magnetic recording is a technology that causes magnetic reversal by passing a spin-polarized current in the in-plane direction of the magnetic recording layer.
- Such a technique is disclosed in, for example, Japanese Unexamined Patent Publication No. 2005-191032, Japanese Unexamined Patent Publication No. 2005-123617, and US Pat. No. 6,781,871.
- the domain wall of the magnetic recording layer is moved, and torque is applied to the magnetization of the magnetic recording layer by the Z or spin-polarized current, thereby magnetically
- the magnetic layer of the recording layer can be reversed.
- the technology that allows spin-polarized current to flow in the in-plane direction of the magnetic recording layer eliminates the need for spin-polarized current to flow through the tunnel barrier layer. The problem of destruction can be effectively avoided.
- an object of the present invention is to provide a technique for suppressing a temperature rise due to a write current flowing in the in-plane direction of a magnetic recording layer.
- a magnetic random access memory includes a magnetization reversal region having reversible magnetization, a magnetic recording layer through which a write current flows in an in-plane direction, and fixed magnetization.
- An endothermic structure Such a magnetic random access memory dissipates heat generated in the magnetic recording layer by the heat absorption structure, and can suppress a temperature rise due to a write current flowing in the in-plane direction.
- the magnetic recording layer further includes a first magnetization fixed region connected to the first boundary of the magnetization switching region, and a second magnetization fixed region connected to the second boundary of the magnetization switching region. And.
- the write current is passed from the first magnetization fixed region to the second magnetization fixed region, or the second magnetic field fixed region force and the first magnetic field fixed region.
- the heat absorbing structure is directly bonded to the magnetic recording layer.
- the magnetic random access memory further includes a first wiring electrically connected to the first magnetization fixed region, and a second wiring electrically connected to the second magnetization fixed region. It comprises.
- the endothermic structure is provided between the first magnetization fixed region and the first wiring. It is preferred that
- the magnetic random access memory further includes a via contact that connects the second magnetic pin fixed region and the second wiring
- an opening is provided in the heat absorbing structure, It is preferable to be provided so as to penetrate the opening.
- the magnetic random access memory is further provided between the second magnetic pin fixed region and the second wiring so as to face the magnetic recording layer, and receives heat generated in the magnetic recording layer. It is preferable to provide another endothermic structure having a function of releasing heat.
- the endothermic structure is directly joined to the first magnet fixing region, and the other endothermic structure is joined directly to the second magnet fixing region.
- the magnetic random access memory further includes a third wiring electrically connected to the magnetic pinned layer
- the heat absorption structure is provided between the third wiring and the magnetic pinned layer. You can be done.
- the endothermic structure is directly joined to the magnetic pinned layer.
- the heat absorbing structure is preferably provided in the via contact layer immediately below the wiring layer in which the third wiring is provided.
- the third wiring has a wiring main body portion extending in a first direction in which a read current flows, and a protruding portion protruding from the wiring main body portion in a second direction perpendicular to the first direction. It is preferable to function as an endothermic structure.
- the first wiring that is electrically connected to the first magnetization fixed region and through which the write current flows is further provided with a wiring main body portion that extends in a first direction through which the write current flows, and a wiring It is preferable to function as a heat absorption structure by including a projecting portion projecting in a second direction perpendicular to the first direction from the main body portion.
- the heat absorption structure is located in the same wiring layer as the first wiring electrically connected to the first magnetization fixed region and the second wiring electrically connected to the second magnetization fixed region. Also good.
- the heat absorbing structure may be located in the same wiring layer as the third wiring electrically connected to the magnetic pinned layer.
- a magnetic random access memory in another aspect of the present invention, includes a magnetization switching region having reversible magnetization, a first magnetization fixed region connected to a first boundary of the magnetization switching region, and a magnetization switching region With a second magnetization fixed region connected to the second boundary of the A magnetic recording layer through which a current flows, a fixed magnetization layer having fixed magnetization, a nonmagnetic layer provided between the magnetization reversal region and the magnetization fixed layer, and the first magnetization fixed region electrically And a first wiring connected.
- the write current is passed from the first magnetization fixed region to the second magnetization fixed region, or from the second magnetization fixed region to the first magnetization fixed region.
- the first wiring has a wiring main body portion extending in a first direction in which a write current flows, and a protrusion protruding from the wiring main body portion in a second direction perpendicular to the first direction and facing the magnetic recording layer. It has.
- the first wiring having the protrusion functions as a heat absorbing structure that dissipates the heat generated in the magnetic recording layer, and is caused by the write current flowing in the in-plane direction. Temperature rise can be suppressed.
- a magnetic random access memory includes a magnetic recording layer including a magnetization switching region having a reversible magnetic field, a write current flowing in an in-plane direction, and a fixed magnetization A non-magnetic layer provided between the magnetization switching region and the magnetization fixed layer, and a third wiring electrically connected to the magnetization fixed layer.
- the third wiring includes a wiring main body portion extending in the first direction in which a read current flows, a protruding portion that protrudes from the wiring main body portion in the second direction perpendicular to the first direction and that faces the magnetic recording layer. It is equipped with.
- the third wiring having the protrusion functions as a heat absorbing structure that dissipates the heat generated in the magnetic recording layer, and is caused by the write current flowing in the in-plane direction. Temperature rise can be suppressed.
- FIG. 1A is a cross-sectional view showing a configuration of an MRAM according to an embodiment of the present invention.
- FIG. 1B is a conceptual diagram illustrating the function of the MRAM in FIG. 1A.
- FIG. 2 is a plan view showing a configuration of an MRAM according to one embodiment of the present invention.
- FIG. 3 is a cross-sectional view showing a configuration of an MRAM according to another embodiment of the present invention.
- FIG. 4 is a cross-sectional view showing a configuration of an MRAM according to still another embodiment of the present invention.
- FIG. 5A is an oblique projection showing the structure of the MRAM in the first example.
- FIG. 5B is a plan view showing the configuration of the MRAM according to the first embodiment.
- FIG. 6A is an oblique projection showing the structure of the MRAM of the second embodiment.
- FIG. 6B is a plan view showing the configuration of the MRAM according to the second embodiment.
- FIG. 7A is an oblique projection showing the structure of the MRAM of the third embodiment.
- FIG. 7B is a plan view showing the configuration of the MRAM according to the third embodiment.
- FIG. 8A is an oblique projection showing the structure of the MRAM of the fourth embodiment.
- FIG. 8B is an oblique projection showing another configuration of the MRAM according to the fourth embodiment.
- FIG. 9A is an oblique projection showing the structure of the MRAM of the fifth embodiment.
- FIG. 9B is an oblique projection showing another configuration of the MRAM according to the fifth embodiment.
- FIG. 9C is an oblique projection showing still another configuration of the MRAM according to the fifth embodiment.
- FIG. 10A is an oblique projection showing the structure of the MRAM of Example 6.
- FIG. 10B is a plan view showing the configuration of the MRAM in Embodiment 6.
- FIG. 11A is an oblique projection showing the structure of the MRAM of Example 7.
- FIG. 11B is a plan view showing the configuration of the MRAM according to the seventh embodiment.
- FIG. 12A is an oblique projection showing the structure of the MRAM of the eighth embodiment.
- FIG. 12B is a plan view showing the configuration of the MRAM according to the eighth embodiment.
- FIG. 13A is a perspective view showing the structure of the MRAM of Example 9.
- FIG. 13B is a plan view showing the configuration of the MRAM according to the ninth embodiment.
- FIG. 1A is a cross-sectional view showing a schematic configuration of an MRAM according to an embodiment of the present invention.
- the memory cell 1 is formed in the insulating layer 10.
- the memory cell 1 includes a magnetic recording layer 2, a tunnel barrier layer 3, and a magnetic pinned layer 4.
- the magnetic recording layer 2 includes a magnetization switching region 5 and magnetic pinned regions 6 and 7.
- the magnetization switching area 5 is an area for storing 1-bit data as the direction of the magnetic field.
- the magnetization switching region 5 has a shape that is long in the X-axis direction.
- the magnetic field of 5 is oriented parallel to the X-axis direction.
- the magnetization switching region 5 is made of a magnetically soft ferromagnet, and the magnetization of the magnetization switching region 5 can be switched.
- the state where the magnetic key direction of the magnetic field inversion region 5 is the + x direction is associated with the data “1”
- the state where the magnetization direction of the magnetization switching region 5 is the X direction is Corresponds to data “0”.
- the magnetic pinned regions 6 and 7 are regions used for injecting the spin-polarized current into the magnetization switching region 5 in the in-plane direction, and both are made of a ferromagnetic material.
- the magnetic domain fixed region 6 is joined to the magnetic domain inversion region 5 at a boundary 8 located at one end of the magnetic domain inversion region 5, and the magnetization fixed region 7 is a boundary located at the other end of the magnetization inversion region 5. 9 is joined to the magnetization switching region 5.
- the magnetic pole fixed regions 6 and 7 are adjacent to the magnetic pole inversion region 5 in the X-axis direction and have a long shape in the X-axis direction.
- the magnetization directions of the magnetic pinned regions 6 and 7 are both fixed to the magnetic field inversion region 5 in the direction of the force.
- the magnetic key of the magnetic key fixing region 6 is fixed toward the + x direction
- the magnetic key of the magnetic key fixing region 7 is fixed toward the X direction.
- the magnetization directions of the magnetic pinned regions 6 and 7 may be fixed toward the direction away from the magnetic pinned region 5.
- the magnetic key of the magnetized fixed region 6 is fixed toward the X direction
- the magnetic key of the magnetic key fixed region 7 is fixed toward the + x direction.
- the tunnel barrier layer 3 is a thin, nonmagnetic insulating layer for allowing a tunnel current to flow between the magnetization fixed layer 4 and the magnetization switching region 5.
- the tunnel barrier layer 3 is made of, for example, acid aluminum (AIO) or magnesium oxide (MgO).
- the magnetic layer pinned layer 4 is a ferromagnetic layer in which the magnetic layer is fixed.
- the magnetic pinned layer 4 is a magnetically hard ferromagnetic material, and is made of, for example, CoFe. As shown in FIG. 2, the magnetic pinned layer 4 has a shape that is long in the X-axis direction, and the magnetic pin of the magnetic pinned layer 4 is directed in the -X direction. .
- the magnetization switching region 5, the tunnel barrier layer 3, and the magnetization fixed layer 4 of the magnetic recording layer 2 constitute a magnetic tunnel junction (MTJ) that exhibits the TMR effect, and the resistance of the magnetic tunnel junction is fixed by magnetization. It depends on the relative direction of magnetization between the layer 4 and the magnetization switching region 5.
- MTJ magnetic tunnel junction
- the magnetic tunnel junction TM R effect is used.
- the resistance of the magnetic tunnel junction composed of the tunnel barrier layer 3 and the magnetization fixed layer 4 depends on the magnetization fixed layer 4, the magnetization switching region 5, and the relative direction of magnetization due to the TMR effect.
- the magnetic tunnel junction exhibits a relatively high resistance
- the magnetization fixed layer 4 and the magnetic switching region 5 When the magnetic fields of these are parallel, the magnetic tunnel junction exhibits a relatively low resistance.
- Data stored in the magnetic recording layer 2 is identified by detecting a change in resistance of the magnetic tunnel junction.
- the change in resistance of the magnetic tunnel junction is measured by applying a predetermined voltage to the magnetic tunnel junction and measuring the current flowing through the magnetic tunnel junction, or by flowing a predetermined current through the magnetic tunnel junction. Can be identified by measuring the voltage generated in
- Data is written into the magnetic domain inversion region 5 by injecting a spin-polarized current from the magnetic domain fixed region 6 or the magnetic domain fixed region 7 into the magnetization inverted region 5.
- a current flows through the magnetic recording layer 2 in the + x direction.
- a spin-polarized current is injected from the magnetization fixed region 6 to the magnetization switching region 5 (the magnetization is fixed in the + x direction).
- the domain wall of the magnetic domain inversion region 5 is pushed in the + x direction by the injected spin-polarized current, or a torque is applied to the magnetic domain and the magnetization of the magnetization inversion region 5 is directed in the + x direction.
- data “1” is written to the magnetic recording layer.
- the MRAM according to the embodiment of the present invention is further provided with heat absorbing structures 11 and 12.
- the endothermic structure 11 is provided so as to face the lower surface of the magnetic recording layer 2, and the endothermic structure 12 is provided so as to face the upper surface of the magnetic recording layer 2.
- These endothermic structures 11 and 12 are made of a material having high thermal conductivity, specifically, a metal such as copper, aluminum, or tungsten, and play a role of receiving and releasing heat generated by the magnetic recording layer 2. .
- the resistance of the magnetic recording layer 2 made of a ferromagnetic material is inevitably large, so that when the spin-polarized current is passed during the write operation, the magnetic recording layer 2 generates heat. It becomes a problem.
- endothermic structures 11, 12 are generated in the magnetic recording layer 2. It functions as a heat sink that dissipates the heat generated and effectively suppresses the temperature rise of the magnetic recording layer 2.
- the MRAM in FIG. 1A it is possible to provide only one of the heat-absorbing structures 11 and 12 provided with the heat-absorbing structures 11 and 12 facing the upper and lower surfaces of the magnetic recording layer 2, respectively. It is.
- the endothermic structure 11 can be directly bonded to the lower surface of the magnetic recording layer 2. It is preferable for the heat absorbing structure 11 to be directly joined to the magnetic recording layer 2 in order to improve the heat dissipation efficiency. Similarly, the endothermic structure 12 can be directly bonded to the magnetization fixed layer 4.
- the geometrical arrangement of the magnetization switching region 5 and the magnetization fixed regions 6 and 7 in the magnetic recording layer 2 is such that the magnetization switching region 5 and the magnetization fixed regions 6 and 7 as shown in FIG.
- the arrangement is not limited to a straight line.
- the magnetization switching region 5 can be formed long in the X-axis direction, while the magnetic pinned regions 6, 7 can be formed long in the y-axis direction.
- the magnetic keys in the magnetic key fixing regions 6 and 7 are both fixed in the + y direction.
- the magnetization of the magnetic domain fixed regions 6 and 7 can both be fixed in the y-direction.
- FIG. 5A is an oblique projection showing the configuration of the MRAM according to the first embodiment.
- the memory cell 1 includes a magnetic recording layer 2, a tunnel barrier layer 3, and a magnetic pinned layer 4.
- the magnetic pinned layer 4 is an upper portion through which a read current I flows through the via contact 19.
- the upper wiring 21 is provided so as to extend in the y-axis direction.
- the read current I flows in the y-axis direction.
- the endothermic structure 11 includes the magnetic recording layer 2 of the memory cell 1 and the write current I
- the endothermic structure 11 is connected to the lower wiring 15 via the via contact 14 and also connected to the magnetized fixed region 6 of the magnetic recording layer 2 via the via contact 13.
- the lower wiring 18 is connected to the magnetic pinned region 7 of the magnetic recording layer 2 through the via contact 16.
- the via contact 16 is provided on the endothermic structure 11. It is provided so as to penetrate the formed opening 11a, and is electrically separated from the endothermic structure 11.
- the data stored in the magnetization switching region 5 of the magnetic recording layer 2 is discriminated.
- a write current I is passed from the lower wiring 15 to the lower wiring 18 or the lower wiring 18 writes to the lower wiring 15 depending on the data to be written.
- a spin-polarized current is injected from the magnetization fixed region 6 to the magnetization switching region 5, and the magnetization of the magnetization switching region 5 is directed in the + x direction. That is, data “1” is written to the magnetic recording layer. Conversely, when the write current I flows from the lower wiring 18 to the lower wiring 15, the magnetization fixed region 7
- a spin-polarized current is injected into the force reversal region 5 and the magnetization of the magnetization reversal region 5 is directed in the ⁇ X direction. That is, data “0” is written to the magnetic recording layer.
- the endothermic structure 11 is preferably arranged in a shape and arrangement so that the area facing the magnetic recording layer 2 is as large as possible.
- FIG. 5B is a plan view showing a preferred shape and arrangement of the endothermic structure 11.
- the endothermic structure 11 is preferably provided so as to face at least the entire magnetization reversal region 5 and the magnetic pinned region 6 of the magnetic recording layer 2. Such an arrangement increases the area facing the magnetic recording layer 2 and effectively improves the heat dissipation efficiency of the heat absorbing structure 11.
- the endothermic structure 11 is made of the magnetic recording layer 2 except for the part facing the opening 11 a provided in the endothermic structure 11. It is preferable that it is provided so as to face the whole.
- the endothermic structure 11 is provided so as to face the entire magnetic recording layer 2 except for the portion facing the opening 11a provided in the endothermic structure 11. The arrangement is shown.
- FIG. 6A is an oblique projection illustrating the configuration of the MRAM according to the second embodiment.
- two endothermic structures 11A and 11B are provided between the magnetic recording layer 2 and the lower wirings 15 and 18. Endotherm
- the structure 11A is connected to the magnetic pinned region 6 of the magnetic recording layer 2 through the via contact 13, and is connected to the lower wiring 15 through the via contact 14.
- the endothermic structure 11 B is connected to the magnetization fixed region 7 of the magnetic recording layer 2 through the via contact 16 and is connected to the lower wiring 18 through the via contact 17.
- the read operation and the write operation are performed in the same manner as the MRAM according to the first embodiment.
- the endothermic structures 11A and 11B are preferably arranged in a shape and arrangement so that the area facing the magnetic recording layer 2 is as large as possible.
- FIG. 6B is a plan view showing a preferred structure and arrangement of the endothermic structures 11A and 1IB.
- the endothermic structure 11A is preferably provided so as to face at least the entire magnetic field fixing area 6 of the magnetic recording layer 2, and the endothermic structure 11B includes at least the magnetic field fixing area of the magnetic recording layer 2. It is preferable to be provided so as to oppose the entirety of 7. Such an arrangement increases the area of the endothermic structures 11A, 1IB facing the magnetic recording layer 2 and effectively improves the heat dissipation efficiency.
- the endothermic structures 11 A and 11 B are disposed so as to face at least a part of the magnetic field inversion region 5 of the magnetic recording layer 2. It is more preferable that the endothermic structures 11A and 1IB are arranged so as to face at least part of the lower surface of the magnetic pinned layer 4 (the surface bonded to the tunnel barrier layer 3). More preferably.
- FIG. 6B shows an arrangement in which the endothermic structures 11A and 1 IB are opposed to a part of the lower surface of the force magnetization fixed layer 4 respectively. It is preferable that the endothermic structures 11A and 11B have a narrow interval, and most preferably, the endothermic structures 11A and 11B are separated by the same interval as the minimum pitch of the design rule of the MRAM. Is preferred.
- FIG. 7A is an oblique projection illustrating the configuration of the MRAM according to the third embodiment.
- the endothermic structure 12 is provided between the magnetic pinned layer 4 and the upper wiring 21 of the memory cell 1.
- the endothermic structure 12 is connected to the magnetic pinned layer 4 via the via contact 19 and is connected to the upper wiring 21 via the via contact 20.
- the read operation and the write operation are performed in the same manner as the MRAM according to the first embodiment.
- the endothermic structure 12 has a shape and a shape so that an area facing the magnetic recording layer 2 is as large as possible. It is preferable to arrange by the arrangement.
- FIG. 7B is a plan view showing a preferred structure and arrangement of the endothermic structure 12.
- the endothermic structure 12 is preferably provided so as to face at least the entire portion of the magnetic recording layer 2 between the via contacts 13 and 16. Such an arrangement makes it possible to dissipate heat of the entire portion of the magnetic recording layer 2 that generates heat (that is, the portion where the spin-polarized current flows). In order to further improve the heat dissipation efficiency, it is more preferable to provide the heat absorption structure 12 force so as to face the entire magnetic recording layer 2. Such an arrangement increases the area facing the magnetic recording layer 2 and effectively improves the heat dissipation efficiency of the heat absorbing structure 12.
- FIG. 8A is an oblique projection illustrating the configuration of the MRAM according to the fourth embodiment.
- the endothermic structure 11 is directly bonded to the entire bottom surface of the magnetic recording layer 2.
- the heat absorbing structure 11 is connected to the lower wiring 15 via the via contact 14 and further connected to the lower wiring 18 via the via contact 17.
- the endothermic structure 11 is formed of a material having a higher resistivity than the magnetic recording layer 2. This is important for allowing a larger amount of write current to flow through the magnetic recording layer 2.
- the write current is shunted to the endothermic structure 11, but the endothermic structure 11 flows to the endothermic structure 11 by being formed of a material having a higher resistivity than the magnetic recording layer 2.
- the current can be reduced.
- the fact that the endothermic structure 11 is directly bonded to the entire bottom surface of the magnetic recording layer 2 makes it easier to transfer heat from the magnetic recording layer 2 to the endothermic structure 11 and effectively improves the heat dissipation efficiency.
- FIG. 8B is a perspective view showing another configuration of the MRAM according to the fourth exemplary embodiment.
- two endothermic structures 11A and 11B are directly bonded to the lower surface of the magnetic recording layer 2.
- the endothermic structure 11A is directly joined to the magnetic pinned region 6 of the magnetic recording layer 2 and connected to the lower wiring 15 via the via contact.
- the endothermic structure 11 B is directly bonded to the magnetic pinned region 7 of the magnetic recording layer 2 and is connected to the lower wiring 18 via the via contact 17.
- the fact that the two endothermic structures 11A, 1 IB are directly bonded to the lower surface of the magnetic recording layer 2 facilitates the transfer of heat from the magnetic recording layer 2 to the endothermic structures 11A, 11B.
- the endothermic structures 11A and 11B are electrically separated, the current flowing through the endothermic structure 11 (without flowing through the magnetic recording layer 2) can be reduced.
- the read operation and the write operation are performed in the same manner as the MRAM according to the first embodiment.
- the endothermic structure 11A has a width in the X-axis direction (less than the lower wiring 15 through which the write current I flows)
- the width in the direction perpendicular to the direction in which the lower wiring 15 extends is large.
- Such a structure facilitates the transfer of heat from the magnetic recording layer 2 to the heat absorbing structures 11A and 1IB, and effectively improves the heat dissipation efficiency.
- the write current I flows.
- the width in the X-axis direction (that is, the width in the direction perpendicular to the direction in which the lower wiring 18 extends) is larger than the lower wiring 18 that is W2.
- FIG. 9A is an oblique projection illustrating the configuration of the MRAM according to the fifth embodiment.
- the endothermic structure 12 is directly bonded to the magnetic pinned layer 4.
- the endothermic structure 12 is provided in a via contact layer located immediately below the wiring layer in which the upper wiring 21 is provided, and the endothermic structure 12 is directly joined to the upper wiring 21.
- the endothermic structure 12 is mainly formed of copper (Cu) or tungsten (W).
- the structure in which the endothermic structure 12 is provided in the via contact layer located immediately below the wiring layer in which the upper wiring 21 is provided does not require an additional step for forming the endothermic structure 12. Is preferred.
- the read operation and write operation of the MRAM of the fifth embodiment having such a configuration are performed in the same manner as the MRAM of the first embodiment.
- the endothermic structure 12 has a width in the X-axis direction (ie, lower than the lower wiring 15 through which the read current I flows).
- the width in the direction perpendicular to the direction in which the lower wiring 15 extends is preferably large. Such a structure facilitates heat transfer from the magnetic recording layer 2 to the heat absorbing structure 12 and effectively improves heat dissipation efficiency.
- the film thickness d of the endothermic structure 12 is preferably thicker than the film thickness d of the magnetic recording layer 2.
- the endothermic structure 12 does not need to be perfectly aligned with the magnetic pinned layer 4.
- the endothermic structure 12 is The magnetic pinned layer 4 can be provided so as to be joined to only a part of the magnetic pinned layer 4. Further, as shown in FIG. 9C, the endothermic structure 12 can be disposed so as to be bonded to the entire upper surface of the magnetic pinned layer 4 and to protrude from the magnetic pinned layer 4. It is.
- FIG. 10A is an oblique projection illustrating the configuration of the MRAM according to the sixth embodiment.
- the upper wiring 21 is formed in a shape that functions as a heat absorbing structure. That is, the upper wiring 21 is provided with a protruding portion 21a that protrudes in a direction (X-axis direction in Example 6) perpendicular to the extending direction (Y-axis direction in Example 6).
- the protruding portion 21a is formed in a shape facing the upper surface of the magnetic recording layer 2.
- the upper wiring 21 having such a shape effectively functions as a heat absorbing structure, and effectively dissipates heat generated in the magnetic recording layer 2.
- the upper wiring 21 functions as an endothermic structure
- a wiring layer for forming the endothermic structure is not required, and thus it is possible to configure the MRAM with a small number of wiring layers.
- the read operation and write operation of the MRAM according to the sixth embodiment having such a configuration are performed in the same manner as the MRAM according to the first embodiment.
- the upper wiring 21 is preferably arranged in a shape and arrangement so that the area facing the magnetic recording layer 2 is as large as possible.
- FIG. 10B is a plan view showing a preferred shape of the upper wiring 21.
- the wiring body portion 21b of the upper wiring 21 is in the y-axis direction (read current I flows
- the protruding portion 21a is provided so as to protrude in the X-axis direction from the wiring body portion 21b.
- the protruding portion 21a is preferably provided so that the upper wiring 21 has a shape that faces at least the entire portion of the magnetic recording layer 2 between the via contacts 13 and 16.
- Such an arrangement enables heat dissipation of the entire portion of the magnetic recording layer 2 that generates heat (that is, the portion where the spin-polarized current flows).
- it is more preferable that the upper wiring 21 is provided so as to face the entire magnetic recording layer 2. Such an arrangement increases the area facing the magnetic recording layer 2 and effectively improves the heat dissipation efficiency of the upper wiring 21.
- FIG. 11A is an oblique projection diagram illustrating the configuration of the MRAM according to the seventh embodiment.
- the lower wirings 15 and 18 are formed in a shape that functions as an endothermic structure. That is, The lower wiring 15 is provided with a projecting portion 15a projecting in a direction (X-axis direction in Example 7) perpendicular to the extending direction (Y-axis direction in Example 7), and the lower wiring 18 is perpendicular to the extending direction. A protruding portion 18a protruding in any direction is provided.
- the protrusions 15a and 18a are formed in a shape facing the upper surface of the magnetic recording layer 2.
- the lower wirings 15 and 18 having such a shape effectively function as a heat absorbing structure and effectively dissipate heat generated in the magnetic recording layer 2.
- a wiring layer for forming the endothermic structure is not required. Therefore, it is possible to configure an MRAM with a small number of wiring layers.
- the read operation and the write operation of the MRAM according to the seventh embodiment having such a configuration are performed in the same manner as the MRAM according to the first embodiment.
- the lower wirings 15 and 18 are preferably arranged in a shape and arrangement so that the area facing the magnetic recording layer 2 is as large as possible.
- FIG. 11B is a plan view showing the shape of a preferred lower wiring 15, 18.
- the wiring body portion 15b of the lower wiring 15 has a y-axis direction (write current I
- the protruding portion 15a is provided so as to protrude in the X-axis direction from the wiring body portion 21b.
- the wiring main body portion 18b of the lower wiring 18 has a y-axis direction (write current I
- the protruding portion 18a is provided so as to protrude in the X-axis direction from the wiring body portion 18b.
- the protrusion 15a is preferably provided so that the lower wiring 15 faces at least the entire magnetic field fixing region 6 of the magnetic recording layer 2.
- the protrusion 18a has at least the lower wiring 18 magnetically. It is preferable that the recording layer 2 is provided so as to face the entire magnetic field fixing region 7. Such an arrangement increases the area where the lower wirings 15 and 18 are opposed to the magnetic recording layer 2 and effectively improves the heat dissipation efficiency.
- the protrusions 15a and 18a are preferably arranged so that the lower wirings 15 and 18 face at least a part of the magnetization switching region 5 of the magnetic recording layer 2. It is more preferable that the magnetic pinned layer 4 is disposed so as to face at least a part of the lower surface (the surface bonded to the tunnel barrier layer 3).
- FIG. 11B shows an arrangement in which the lower wirings 15 and 18 are opposed to a part of the lower surface of the magneto-magnetic pinned layer 4.
- the protrusions 15a and 18a preferably have a small interval, and most preferably, the protrusions 15a and 18a are provided on the MRAM. It is preferable that they are separated by the same interval as the minimum pitch of the design rule.
- FIG. 12A is a perspective view illustrating the configuration of the MRAM according to the eighth embodiment.
- the heat absorbing structure 11 facing the lower surface of the magnetic recording layer 2 is provided in the same wiring layer as the wiring layer in which the lower wirings 15 and 18 are formed.
- the heat absorbing structure 11 is provided between the lower wirings 15 and 18 and is electrically insulated from the lower wirings 15 and 18.
- the configuration in which the endothermic structure 11 is provided in the same wiring layer as the wiring layer in which the lower wirings 15 and 18 are formed is preferable because a process for forming the endothermic structure is not additionally required. .
- the endothermic structure 11 is preferably arranged in a shape and arrangement so that the area facing the magnetic recording layer 2 is as large as possible. For this purpose, it is preferable that the endothermic structure 11 is provided so as to cross the magnetic recording layer 2 as shown in FIG. 12B.
- the lower wiring 15 and the endothermic structure 11 are separated at the same pitch as the minimum pitch of the design rule of the MRAM. It is suitable. Similarly, the lower wiring 18 and the endothermic structure 11 are preferably separated at the same interval as the minimum pitch of the design rule of the MRAM.
- FIG. 13A is a perspective view illustrating the configuration of the MRAM according to the eighth embodiment.
- the heat absorbing structures 12A and 12B facing the upper surface of the magnetic recording layer 2 are provided in the same wiring layer as the wiring layer in which the upper wiring 21 is formed.
- the heat absorbing structures 12A and 12B are electrically insulated from the upper wiring 21.
- the configuration in which the heat absorbing structures 12A and 12B are provided in the same wiring layer as the wiring layer in which the upper wiring 21 is formed is preferable because it does not require additional steps for forming the heat absorbing structure. is there.
- the endothermic structures 12A and 12B are arranged in such a shape and arrangement that the area facing the magnetic recording layer 2 is as large as possible.
- the endothermic structures 12A and 12B have at least one of the magnetic inversion regions 5 of the magnetic recording layer 2.
- the heat absorption structures 12A and 12B are joined to the upper surface of the magnetic pinned layer 4 (bonded to the tunnel barrier layer 3). It is further preferable to arrange the surface to face at least a part of the surface.
- each of the heat absorbing structures 12A and 12B is opposed to a part of the upper surface of the force / magnetic pinned layer 4. It is preferable that the distance between the upper wiring 21 and the endothermic structure 12A is narrow, and most preferably, the upper wiring 21 and the endothermic structure 12A have the same interval as the minimum pitch of the design rule of the MRAM. It is preferred that they are separated. Similarly, it is preferable that the upper wiring 21 and the endothermic structure 12B are separated by the same interval as the minimum pitch of the design rule of the MRAM.
- an MRAM including only one of the endothermic structure facing the upper surface of the magnetic recording layer 2 and the endothermic structure facing the lower surface is presented.
- the heat dissipation efficiency is further improved.
- the MRAM includes both the endothermic structure facing the upper surface of the magnetic recording layer 2 and the endothermic structure facing the lower surface.
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- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Hall/Mr Elements (AREA)
- Mram Or Spin Memory Techniques (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/297,153 US8351249B2 (en) | 2006-04-11 | 2007-04-09 | Magnetic random access memory |
JP2008510946A JP5099368B2 (ja) | 2006-04-11 | 2007-04-09 | 磁気ランダムアクセスメモリ |
US13/590,634 US8547733B2 (en) | 2006-04-11 | 2012-08-21 | Magnetic random access memory |
US13/606,737 US8526222B2 (en) | 2006-04-11 | 2012-09-07 | Magnetic random access memory |
US14/011,094 US8923042B2 (en) | 2006-04-11 | 2013-08-27 | Magnetic random access memory |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006-108480 | 2006-04-11 | ||
JP2006108480 | 2006-04-11 |
Related Child Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/297,153 A-371-Of-International US8351249B2 (en) | 2006-04-11 | 2007-04-09 | Magnetic random access memory |
US13/590,634 Division US8547733B2 (en) | 2006-04-11 | 2012-08-21 | Magnetic random access memory |
US13/606,737 Division US8526222B2 (en) | 2006-04-11 | 2012-09-07 | Magnetic random access memory |
Publications (1)
Publication Number | Publication Date |
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WO2007119708A1 true WO2007119708A1 (ja) | 2007-10-25 |
Family
ID=38609468
Family Applications (1)
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PCT/JP2007/057839 WO2007119708A1 (ja) | 2006-04-11 | 2007-04-09 | 磁気ランダムアクセスメモリ |
Country Status (3)
Country | Link |
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US (4) | US8351249B2 (ja) |
JP (1) | JP5099368B2 (ja) |
WO (1) | WO2007119708A1 (ja) |
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Also Published As
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US20120326254A1 (en) | 2012-12-27 |
US20130341744A1 (en) | 2013-12-26 |
US20120320667A1 (en) | 2012-12-20 |
JP5099368B2 (ja) | 2012-12-19 |
US8547733B2 (en) | 2013-10-01 |
US8351249B2 (en) | 2013-01-08 |
US20100149862A1 (en) | 2010-06-17 |
JPWO2007119708A1 (ja) | 2009-08-27 |
US8526222B2 (en) | 2013-09-03 |
US8923042B2 (en) | 2014-12-30 |
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