摘要:
A magnetic recording sensor with AFM exchange coupled shield stabilization for use in a data storage device includes a read sensor positioned between a bottom shield and a top shield. The top shield comprises a first ferromagnetic (FM) layer, a coupling layer, and a second FM layer. An exchange coupling insertion layer is provided between the second FM layer and an antiferromagnetic (AFM) layer above. In an embodiment of the invention, the exchange coupling insertion layer comprises CoFe with a Fe content from about 35-45 at. %, and thickness from about 1 nm to about 3 nm. In another embodiment of the invention, the exchange coupling insertion layer comprises a bi-layer, including first sub-layer comprising CoFe with Fe content from about 8-12 at. %, and second sub-layer comprising CoFe with Fe content from about 35-45 at. %, and the bi-layer has a thickness less than about 4 nm.
摘要:
A magnetic sensor is configured to reside in proximity to a recording medium during use. The sensor includes a magnetic top shield and a magnetic bottom shield. A top sensor stack is under the magnetic top shield and includes magnetic sensing layers. A bottom sensor stack is between the magnetic bottom shield and the top sensor stack. The bottom sensor stack includes a magnetic seed stack above the bottom shield, an insertion stack above the magnetic seed stack, and an antiferromagnetic (AFM) layer on and in contact with the insertion stack. A pinned layer is above the AFM layer. An AFM coupling layer is above the pinned layer. In some aspects the insertion stack may include at least one of Ti, Hf, Zr, and Ta. In some aspect, the insertion stack includes a layer of elemental Ti. In other aspects, the insertion stack includes multilayer structures.
摘要:
Methods of writing to a multi-bit MRAM memory unit are described. The method includes to self-detected writing to a multi-bit (i.e., multilevel) thermally assisted MRAM. The self-detected writing increases a reading margin between data state levels and decreases reading margin variability due to cell resistance variation.
摘要:
A magnetic stack having a ferromagnetic free layer, a metal oxide layer that is antiferromagnetic at a first temperature and non-magnetic at a second temperature higher than the first temperature, a ferromagnetic pinned reference layer, and a non-magnetic spacer layer between the free layer and the reference layer. During a writing process, the metal oxide layer is non-magnetic. For magnetic memory cells, such as magnetic tunnel junction cells, the metal oxide layer provides reduced switching currents.
摘要:
A method and system for providing a magnetic read transducer is described. The magnetic read transducer includes a bilayer magnetic seed layer, an antiferromagnetic (AFM) layer, and a read sensor. The bilayer magnetic seed layer includes a Ni1-xFex layer and a Ni1-yFey layer on the Ni1-xFex layer, where x is at least 0.3 and not more than 1 and where y is not more than 0.19. The AFM layer resides on the bilayer magnetic seed layer. The read sensor is on the AFM layer.
摘要:
A magnetic stack having a ferromagnetic free layer, a metal oxide layer that is antiferromagnetic at a first temperature and non-magnetic at a second temperature higher than the first temperature, a ferromagnetic pinned reference layer, and a non-magnetic spacer layer between the free layer and the reference layer. During a writing process, the metal oxide layer is non-magnetic. For magnetic memory cells, such as magnetic tunnel junction cells, the metal oxide layer provides reduced switching currents.
摘要:
A magnetic stack having a ferromagnetic free layer, a metal oxide layer that is antiferromagnetic at a first temperature and non-magnetic at a second temperature higher than the first temperature, a ferromagnetic pinned reference layer, and a non-magnetic spacer layer between the free layer and the reference layer. During a writing process, the metal oxide layer is non-magnetic. For magnetic memory cells, such as magnetic tunnel junction cells, the metal oxide layer provides reduced switching currents.
摘要:
Methods of writing to a multi-bit MRAM memory unit are described. The method includes to self-detected writing to a multi-bit (i.e., multilevel) thermally assisted MRAM. The self-detected writing increases a reading margin between data state levels and decreases reading margin variability due to cell resistance variation.
摘要:
Self-reference reading a magnetic tunnel junction data cell methods are disclosed. An illustrative method includes applying a read voltage across a magnetic tunnel junction data cell and forming a read current. The magnetic tunnel junction data cell has a first resistance state. The read voltage is sufficient to switch the magnetic tunnel junction data cell resistance. The method includes detecting the read current and determining if the read current remains constant during the applying step. If the read current remains constant during the applying step, then the first resistance state of the magnetic tunnel junction data cell is the resistance state that the read voltage was sufficient to switch the magnetic tunnel junction data cell to.
摘要:
An apparatus and associated method for a non-volatile memory cell with a phonon-blocking insulating layer. In accordance with various embodiments, a magnetic stack has a tunnel junction, ferromagnetic free layer, pinned layer, and an insulating layer that is constructed of an electrically and thermally insulative material that blocks phonons while allowing electrical transmission through at least one conductive feature.