Magnetic logic unit (MLU) cell for sensing magnetic fields with improved programmability and low reading consumption
First Claim
1. A magnetic logic unit (MLU) cell for sensing magnetic fields, comprising:
- a magnetic tunnel junction including a storage layer having a storage magnetization, a sense layer having a sense magnetization, a tunnel barrier layer between the storage layer and the sense layer, and a pinning layer pinning the storage magnetization at a low threshold temperature and freeing it at a high threshold temperature;
the sense magnetization being freely alignable at the low and high threshold temperatures;
the storage layer inducing an exchange bias field magnetically coupling the sense layer such that the sense magnetization is aligned antiparallel or parallel to the storage magnetization;
wherein the tunnel barrier layer is configured for generating an indirect exchange coupling between the tunnel barrier layer and the sense layer such as to provide an additional exchange bias field.
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Abstract
A magnetic logic unit (MLU) cell for sensing magnetic fields, including: a magnetic tunnel junction including a storage layer having a storage magnetization, a sense layer having a sense magnetization; a tunnel barrier layer between the storage layer and the sense layer; and a pinning layer pinning the storage magnetization at a low threshold temperature and freeing it at a high threshold temperature. The sense magnetization is freely alignable at the low and high threshold temperatures and the storage layer induces an exchange bias field magnetically coupling the sense layer such that the sense magnetization tends to be aligned antiparallel or parallel to the storage magnetization. The tunnel barrier layer is configured for generating an indirect exchange coupling between the tunnel barrier layer and the sense layer providing an additional exchange bias field.
4 Citations
16 Claims
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1. A magnetic logic unit (MLU) cell for sensing magnetic fields, comprising:
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a magnetic tunnel junction including a storage layer having a storage magnetization, a sense layer having a sense magnetization, a tunnel barrier layer between the storage layer and the sense layer, and a pinning layer pinning the storage magnetization at a low threshold temperature and freeing it at a high threshold temperature;
the sense magnetization being freely alignable at the low and high threshold temperatures;the storage layer inducing an exchange bias field magnetically coupling the sense layer such that the sense magnetization is aligned antiparallel or parallel to the storage magnetization; wherein the tunnel barrier layer is configured for generating an indirect exchange coupling between the tunnel barrier layer and the sense layer such as to provide an additional exchange bias field. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for operating a MLU cell comprising a magnetic tunnel junction including a storage layer having a storage magnetization, a sense layer having a sense magnetization, a tunnel barrier layer between the storage layer and the sense layer, and a pinning layer pinning the storage magnetization at a low threshold temperature and freeing it at a high threshold temperature;
- the sense magnetization being freely alignable at the low and high threshold temperatures;
the storage layer inducing an exchange bias field magnetically coupling the sense layer such that the sense magnetization is aligned antiparallel or parallel to the storage magnetization;
the tunnel barrier layer is configured for generating an indirect exchange coupling between the tunnel barrier layer and the sense layer such as to provide an additional exchange bias field;
the method comprising;during a programming operation, aligning the storage magnetization in a programmed direction; and during a sensing operation, measuring a resistance of the MLU cell having the storage magnetization in the programmed direction; wherein the tunnel barrier layer is configured such that the additional exchange bias field is of substantially the same magnitude than the one of the exchange bias field and of opposed direction, such that substantially no additional current need to be passed in a field line for compensating the exchange bias field. - View Dependent Claims (15, 16)
- the sense magnetization being freely alignable at the low and high threshold temperatures;
Specification