Abstract: A magnetic junction usable in magnetic devices is described. The magnetic junction includes a reference layer, a free layer, a nonmagnetic spacer layer between the reference and free layers, and a rare earth-transition metal (RE-TM) layer in the reference and/or free layers. The free layer is switchable between stable magnetic states when a write current is passed through the magnetic junction. If the RE-TM layer is in the free layer then the RE-TM layer is between hard and soft magnetic layers in the free layer. In this aspect, the RE-TM layer has a standby magnetic moment greater than a write magnetic moment. If the RE-TM layer is in the reference layer, then the magnetic junction includes a second RE-TM layer. In this aspect, a first saturation magnetization quantity of the RE-TM layer matches a second saturation magnetization quantity of the second RE-TM layer over an operating temperature range.

Abstract: A quantum computing device magnetic memory is described. The quantum computing device magnetic memory is coupled with a quantum processor including at least one quantum device corresponding to at least one qubit. The quantum computing device magnetic memory includes magnetic storage cells coupled with the quantum device(s) and bit lines coupled to the magnetic storage cells. Each of the magnetic storage cells includes at least one magnetic junction. The magnetic junction(s) include a reference layer, a nonmagnetic spacer layer, and a free layer. The nonmagnetic spacer layer is between the reference layer and the free layer. The magnetic junction(s) are configured to allow the free layer to be switched between stable magnetic states. The magnetic junction(s) are configured such that the free layer has a nonzero initial writing spin transfer torque in an absence of thermal fluctuations.

Abstract: A magnetic junction usable in a magnetic device and a method for providing the magnetic junction are described. The magnetic junction includes a free layer, a pinned layer and nonmagnetic spacer layer between the free and pinned layers. At least one of the free and pinned layers includes at least one engineered Heusler structure having a first magnetic layer, a second magnetic layer and an amorphous layer between the magnetic layers. At least one of the first and second magnetic layer(s) is a Heusler layer. The first magnetic layer's perpendicular magnetic anisotropy energy (PMAE) exceeds is out-of-plane demagnetization energy. The second magnetic layer's PMAE exceeds its out-of-plane demagnetization energy. The free layer and/or the pinned layer has a PMAE greater than an out-of-plane demagnetization energy. The free layer is switchable between stable magnetic states when a write current is passed through the magnetic junction.

Abstract: A magnetic junction usable in magnetic devices is described. The magnetic junction includes a reference layer, a free layer, a nonmagnetic spacer layer between the reference and free layers, and a rare earth-transition metal (RE-TM) layer in the reference and/or free layers. The free layer is switchable between stable magnetic states when a write current is passed through the magnetic junction. If the RE-TM layer is in the free layer then the RE-TM layer is between hard and soft magnetic layers in the free layer. In this aspect, the RE-TM layer has a standby magnetic moment greater than a write magnetic moment. If the RE-TM layer is in the reference layer, then the magnetic junction includes a second RE-TM layer. In this aspect, a first saturation magnetization quantity of the RE-TM layer matches a second saturation magnetization quantity of the second RE-TM layer over an operating temperature range.

Abstract: In one embodiment, a device includes a reference layer, a free layer positioned above the reference layer, and a spacer layer positioned between the reference layer and the free layer, the spacer layer providing a gap between the reference layer and the free layer, wherein the reference layer extends beyond a rear extent of the free layer in an element height direction perpendicular to a media-facing surface of the device, and wherein a rear portion of the spacer layer that extends beyond the rear extent of the free layer has an increased resistivity in comparison with a resistivity of a rest of the spacer layer. In other embodiments, a method for forming the device is presented, along with other device structures having an extended pinned layer (EPL).

Abstract: A current-perpendicular-to-the-plane giant magnetoresistance (CPP-GMR) has a multilayer reference layer containing a Heusler alloy. The multilayer reference layer includes a crystalline non-Heusler alloy ferromagnetic layer on an antiferromagnetic layer, a Heusler alloy layer, and an intermediate crystalline non-Heusler alloy of the form CoFeX, where X is one or more of Ge, Al, Si and Ga, located between the non-Heusler alloy layer and the Heusler alloy layer. The CoFeX alloy layer has a composition (CoyFe(100-y))zX(100-z) where y is between about 10 and 90 atomic percent, and z is between about 50 and 90 atomic percent. The CoFeX alloy layer induces very strong pinning, which greatly lessens the likelihood of magnetic instability by the spin polarized electron flow from the free layer to the reference layer.

Abstract: A magnetic junction usable in a magnetic device and a method for providing the magnetic junction are described. The magnetic junction includes a free layer, a pinned layer and nonmagnetic spacer layer between the free and pinned layers. At least one of the free and pinned layers includes at least one engineered Heusler structure having a first magnetic layer, a second magnetic layer and an amorphous layer between the magnetic layers. At least one of the first and second magnetic layer(s) is a Heusler layer. The first magnetic layer's perpendicular magnetic anisotropy energy (PMAE) exceeds is out-of-plane demagnetization energy. The second magnetic layer's PMAE exceeds its out-of-plane demagnetization energy. The free layer and/or the pinned layer has a PMAE greater than an out-of-plane demagnetization energy. The free layer is switchable between stable magnetic states when a write current is passed through the magnetic junction.

Abstract: A quantum computing device magnetic memory is described. The quantum computing device magnetic memory is coupled with a quantum processor including at least one quantum device corresponding to at least one qubit. The quantum computing device magnetic memory includes magnetic storage cells coupled with the quantum device(s) and bit lines coupled to the magnetic storage cells. Each of the magnetic storage cells includes at least one magnetic junction. The magnetic junction(s) include a reference layer, a nonmagnetic spacer layer, and a free layer. The nonmagnetic spacer layer is between the reference layer and the free layer. The magnetic junction(s) are configured to allow the free layer to be switched between stable magnetic states. The magnetic junction(s) are configured such that the free layer has a nonzero initial writing spin transfer torque in an absence of thermal fluctuations.

Abstract: A current-perpendicular-to-the-plane giant magnetoresistance (CPP-GMR) has a multilayer reference layer containing a Heusler alloy. The multilayer reference layer includes a crystalline non-Heusler alloy ferromagnetic layer on an antiferromagnetic layer, a Heusler alloy layer, and an intermediate crystalline non-Heusler alloy of the form CoFeX, where X is one or more of Ge, Al, Si and Ga, located between the non-Heusler alloy layer and the Heusler alloy layer. The CoFeX alloy layer has a composition (CoyFe(100-y))zX(100-z) where y is between about 10 and 90 atomic percent, and z is between about 50 and 90 atomic percent. The CoFeX alloy layer induces very strong pinning, which greatly lessens the likelihood of magnetic instability by the spin polarized electron flow from the free layer to the reference layer.

Abstract: A method for making a current-perpendicular-to-the-plane (CPP) magnetoresistive (MR) sensor that has a reference layer with low coercivity includes first depositing, within a vacuum chamber, a seed layer and an antiferromagnetic layer on a substrate without the application of heat. The substrate with deposited layers is then heated to between 200-600° C. for between 1 to 120 minutes. The substrate with deposited layers is then cooled, preferably to room temperature (i.e., below 50° C., but to at least below 100° C., in the vacuum chamber. After cooling of the antiferromagnetic layer, the ferromagnetic reference layer is deposited on the antiferromagnetic layer. Then the substrate with deposited layers is removed from the vacuum chamber and subjected to a second annealing, in the presence of a magnetic field, by heating to a temperature between 200-400° C. for between 0.5-50 hours.

Abstract: A method for making a current-perpendicular-to-the-plane (CPP) magnetoresistive (MR) sensor that has a reference layer with low coercivity includes first depositing, within a vacuum chamber, a seed layer and an antiferromagnetic layer on a substrate without the application of heat. The substrate with deposited layers is then heated to between 200-600° C. for between 1 to 120 minutes. The substrate with deposited layers is then cooled, preferably to room temperature (i.e., below 50° C., but to at least below 100° C., in the vacuum chamber. After cooling of the antiferromagnetic layer, the ferromagnetic reference layer is deposited on the antiferromagnetic layer. Then the substrate with deposited layers is removed from the vacuum chamber and subjected to a second annealing, in the presence of a magnetic field, by heating to a temperature between 200-400° C. for between 0.5-50 hours.

Abstract: A magnetoresistive sensor that has a free layer with a face centered cubic, 100 crystal orientation formed on an underlayer structure that has been deposited in the presence of nitrogen. The free layer can be constructed of CoFe, Co2(Mn(1-y)Fey)X (where 0?y?1 and X is Si, Ge, Sn, Al, Ga, or a combination thereof), CoFeX (where X is Si, Ge, Sn, Al, Ga, or a combination thereof). The under-layer can include a layer of Ta, a Cu layer formed over the layer of Ta and deposited using a process gas comprising about 20 percent nitrogen and a layer of Ag deposited over the layer of Cu and deposited using a process gas comprising about 50 to 100 percent nitrogen.

Abstract: A method for making a current-perpendicular-to the-plane giant magnetoresistance (CPP-GMR) sensor with a Heusler alloy pinned layer on the sensor's Mn-containing antiferromagnetic pinning layer uses two annealing steps. A layer of a crystalline non-Heusler alloy ferromagnetic material, like Co or CoFe, is deposited on the antiferromagnetic pinning layer and a layer of an amorphous X-containing ferromagnetic alloy, like a CoFeBTa layer, is deposited on the Co or CoFe crystalline layer. After a first in-situ annealing of the amorphous X-containing ferromagnetic alloy, the Heusler alloy pinned layer is deposited on the amorphous X-containing ferromagnetic layer and a second high-temperature annealing step is performed to improve the microstructure of the Heusler alloy pinned layer.

Abstract: A current-perpendicular-to-the-plane giant magnetoresistance (CPP-GMR) sensor has a multilayer reference layer containing a Heusler alloy. The multilayer reference layer may be a simple pinned layer or the AP2 layer of an antiparallel (AP)-pinned structure. The multilayer reference layer is formed of a crystalline non-Heusler alloy ferromagnetic layer on either an antiferromagnetic layer (in a simple pinned structure) or an antiparallel coupling (APC) layer (in an AP-pinned structure), a Heusler alloy layer adjacent the sensor's nonmagnetic electrically conducting spacer layer, and an intermediate substantially non-crystalline X-containing layer between the crystalline non-Heusler alloy layer and the Heusler alloy layer. The element X is selected from one or more of tantalum (Ta), hafnium (Hf), niobium (Nb) and boron (B).

Abstract: A current-perpendicular-to-the-plane magnetoresistive sensor has magnetic damping material located adjacent either or both of the sensor side edges and back edge to reduce the effect of spin transfer torque. The damping material may be Pt, Pd, Os, or a rare earth metal from the 15 lanthanoid elements. The damping material may be an ultrathin layer in contact with the sensor edges. An insulating layer is deposited on the damping layer and isolates the sensor's ferromagnetic biasing layer from the damping layer. Instead of being a separate layer, the damping material may be formed adjacent the sensor edges by being incorporated into the material of the insulating layer.

Abstract: A method for making a current-perpendicular-to the-plane giant magnetoresistance (CPP-GMR) sensor with a Heusler alloy pinned layer on the sensor's Mn-containing antiferromagnetic pinning layer uses two annealing steps. A layer of a crystalline non-Heusler alloy ferromagnetic material, like Co or CoFe, is deposited on the antiferromagnetic pinning layer and a layer of an amorphous X-containing ferromagnetic alloy, like a CoFeBTa layer, is deposited on the Co or CoFe crystalline layer. After a first in-situ annealing of the amorphous X-containing ferromagnetic alloy, the Heusler alloy pinned layer is deposited on the amorphous X-containing ferromagnetic layer and a second high-temperature annealing step is performed to improve the microstructure of the Heusler alloy pinned layer.

Abstract: A current-perpendicular-to-the-plane giant magnetoresistance (CPP-GMR) sensor has a multilayer reference layer containing a Heusler alloy. The multilayer reference layer may be a simple pinned layer or the AP2 layer of an antiparallel (AP)-pinned structure. The multilayer reference layer is formed of a crystalline non-Heusler alloy ferromagnetic layer on either an antiferromagnetic layer (in a simple pinned structure) or an antiparallel coupling (APC) layer (in an AP-pinned structure), a Heusler alloy layer adjacent the sensor's nonmagnetic electrically conducting spacer layer, and an intermediate substantially non-crystalline X-containing layer between the crystalline non-Heusler alloy layer and the Heusler alloy layer. The element X is selected from one or more of tantalum (Ta), hafnium (Hf), niobium (Nb) and boron (B).

Abstract: A magnetic field sensing system with a current-perpendicular-to-the-plane (CPP) sensor, like that used for giant magnetoresistive (GMR) and tunneling magnetoresistive (TMR) spin-valve (SV) sensors, operates in a mode different from conventional GMR-SV and TMR-SV systems. An alternating-current (AC) source operates at a fixed selected frequency and directs AC perpendicularly through the layers of the CPP sensor, with the AC amplitude being high enough to deliberately induce a spin-torque in the CPP sensor's free layer. The AC-induced spin-torque at the selected frequency causes oscillations in the magnetization of the free layer that give rise to a DC voltage signal VDC. VDC is a direct result of only the oscillations induced in the free layer. The value of VDC will change in response to the magnitude of the external magnetic field being sensed and as the free layer is driven in and out of resonance with the AC.

Abstract: A method for making a current-perpendicular-to-the plane magnetoresistive (CPP-MR) sensor with an antiparallel-free APF structure having the first free layer (FL1) formed of an alloy, like a Heusler alloy, that requires high-temperature or extended-time post-deposition annealing includes the step of annealing the Heusler alloy material before deposition of the antiparallel coupling layer (APC) of the APF structure. In a modification to the method, a protection layer, for example, a layer of Ru, Ta, Ti, Al, CoFe, CoFeB or NiFe, may deposited on the layer of Heusler alloy material prior to annealing, and then etched away to expose the underlying Heusler alloy layer as FL1.

Abstract: A tunneling magnetoresistance (TMR) device, like a TMR read head for a magnetic recording disk drive, has low magnetic damping, and thus low mag-noise, as a result of the addition of a ferromagnetic backing layer to the ferromagnetic free layer. The backing layer is a material with a low Gilbert damping constant or parameter ?, the well-known dimensionless coefficient in the Landau-Lifshitz-Gilbert equation. The backing layer may have a thickness such that it contributes up to two-thirds of the total moment/area of the combined free layer and backing layer. The backing layer may be formed of a material having a composition selected from (CoxFe(100-x))(100-y)Xy, (Co2Mn)(100-y)Xy and (Co2FexMn(1-x))(100-y)Xy, where X is selected from Ge, Al and Si, and (Co2Fe)(100-y)Aly, where y is in a range that results in a low damping constant for the material.