Characteristics of AP bias in spin valve memory elements

Zhu, Jun; Zheng, Yuankai

doi:10.1109/20.706357

Cited by 64 publications

(17 citation statements)

References 2 publications

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“…The small shift of the Fraunhofer pattern, on the other hand, indicates that only the F' layers are magnetized in the direction of H app . This scenario is perfectly plausible in the light of the "spin-flop" transition of the SAF [16,17]. To identify the magnetic structure responsible for the enhancement of the spin-triplet supercurrent, we made a large-area sample of the form Si/Nb(150 nm)/Cu(10 nm)/Co(6 nm)/Ru(0.6nm)/Co(6nm)/Cu(10 nm), which has the Josephson junction layer structure shown in Fig.…”

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confidence: 89%

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Optimization of Spin-Triplet Supercurrent in Ferromagnetic Josephson Junctions

et al. 2012

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In the past year, several groups have observed evidence for long-range spin-triplet supercurrent in Josephson junctions containing ferromagnetic (F) materials. In our work, the spin-triplet pair correlations are created by non-collinear magnetizations between a central Co/Ru/Co "synthetic antiferromagnet" (SAF) and two outer thin F layers. Here we present data showing that the spin-triplet supercurrent is enhanced up to 20 times after our samples are subject to a large in-plane magnetizing field. This surprising result can be explained if the Co/Ru/Co SAF undergoes a "spin-flop" transition, whereby the two Co layer magnetizations end up perpendicular to the magnetizations of the two thin F layers. Direct experimental evidence for the spin-flop transition comes from scanning electron microscopy with polarization analysis and from spin-polarized neutron reflectometry.

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confidence: 89%

“…This SAF "spin-flop" transition was predicted and first demonstrated over a decade ago. [16,17] Our sample geometry is illustrated in Fig. 1.…”

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confidence: 99%

Optimization of Spin-Triplet Supercurrent in Ferromagnetic Josephson Junctions

et al. 2012

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“…At low fields, the hard axis saturation process is the minimum energy magnetic saturation process, and there is a torque on the particles to align the hard axis to the applied field. 15,16 At high fields, the easy axis saturated state is the lower energy magnetic configuration. The global energy minimum saturation process shown by the black curves in Figures 2(a) and 2(b) reflects this and explains the two different chaining configurations shown in Figures 1(e) and 1(f).…”

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confidence: 99%

The mechanical response in a fluid of synthetic antiferromagnetic and ferrimagnetic microdiscs with perpendicular magnetic anisotropy

Vemulkar

Welbourne

Mansell

et al. 2017

Applied Physics Letters

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In this article, we demonstrate the magneto-mechanic behavior in a fluid environment of perpendicularly magnetized microdiscs with antiferromagnetic interlayer coupling. When suspended in a fluid and under the influence of a simple uniaxial applied magnetic field sequence, the microdiscs mechanically rotate to access the magnetic saturation processes that are either that of the easy axis, hard axis, or in-between the two, in order to lower their energy. Further, these transitions enable the magnetic particles to form reconfigurable magnetic chains, and transduce torque from uniaxial applied fields. These microdiscs offer an attractive platform for the fabrication of fluid based micro- and nanodevices, and dynamically self assembled complex architectures.

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“…16 The explanation is that the F' and F" layers are magnetized parallel to the field, while the SAF undergoes a "spinflop" transition whereby the two Co layers end up with their magnetization perpendicular to the direction of the applied field. 17,18 According to theory, [19][20][21][22] this configuration with perpendicular magnetizations maximizes the magnitude of the spin-triplet supercurrent. If angles θ1 and θ2 have the same sign (where we constrain |θ1|, |θ2| < π), the junction will have π coupling; if they have opposite signs, the junction will have 0 coupling.…”

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confidence: 99%

Area-dependence of spin-triplet supercurrent in ferromagnetic Josephson junctions

2012

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Josephson junctions containing multiple ferromagnetic layers can carry spin-triplet supercurrent under certain conditions. Large-area junctions containing multiple domains are expected to have a random distribution of 0 or π coupling across the junction surface, whereas magnetized samples should have uniquely π coupling everywhere. We have measured the area dependence of the critical current in such junctions, and confirm that the critical current scales linearly with area in magnetized junctions. For as-grown (multi-domain) samples, the results are mixed. Samples grown on a thick Nb base exhibit critical currents that scale sub-linearly with area, while samples grown on a smoother Nb/Al multilayer base exhibit critical currents that scale linearly with area. The latter results are consistent with a theoretical picture due to Zyuzin and Spivak that predicts that the as-grown samples should have global π/2 coupling.

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Characteristics of AP bias in spin valve memory elements

Cited by 64 publications

References 2 publications

Optimization of Spin-Triplet Supercurrent in Ferromagnetic Josephson Junctions

Optimization of Spin-Triplet Supercurrent in Ferromagnetic Josephson Junctions

The mechanical response in a fluid of synthetic antiferromagnetic and ferrimagnetic microdiscs with perpendicular magnetic anisotropy

Area-dependence of spin-triplet supercurrent in ferromagnetic Josephson junctions

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