Flexible Spin Valves: Interlayer Interaction and Deformation Sensitivity

Abstract Exchange-coupled spin valves based on ferromagnetic alloys CoFeNi and antiferromagnetic alloy FeMn are obtained on flexible polyimide substrates by magnetron sputtering. The magnetoresistive properties of films and microstrips of spin valves are measured at various degrees of bending deformation of the sample. The behavior of the dependence of the deformation sensitivity of the spin valve on the interaction between the magnetic layers and on the arrangement of the anisotropy axes with respect to the deformation vector is characterized. It is found that the deformation sensitivity decreases with an increase in the interval between the fields of magnetization reversal of the free and fixed layers in the spin valve.

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Co/Cu/Co Pseudo Spin-Valve System Prepared by Magnetron Sputtering with Different Argon Pressure

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.644.211 ◽

2015 ◽

Vol 644 ◽

pp. 211-214 ◽

Cited By ~ 4

Author(s):

A.V. Svalov ◽

A.N. Sorokin ◽

P.A. Savin ◽

Alfredo García-Arribas ◽

A. Fernández ◽

...

Keyword(s):

Magnetron Sputtering ◽

Spin Valve ◽

Spin Rotation ◽

Argon Pressure ◽

Dc Magnetron Sputtering ◽

Soft Layer ◽

Valve System ◽

Magnetic Layers ◽

Moderate Field ◽

The Difference

Thin Co films were fabricated by DC magnetron sputtering. The effect of argon pressure on the microstructure, surface morphology and magnetic properties of the samples was systematically studied. It was found that with the increase of argon pressure, the sharpness of the crystalline texture of the samples declines, the roughness of film surfaces and the coercivity of the films increase. Based on these results, a Co/Cu/Co pseudo spin-valve system was designed and the corresponding structures were fabricated. The difference in coercivity of magnetic layers was obtained by deposition of the Co layers at different Ar pressures. Change of the resistance of this trilayer is induced at a moderate field by the spin rotation in the soft layer with lower coercivity.

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Giant Magnetoresistance Induced by Ultrathin Magnetic Layers

MRS Proceedings ◽

10.1557/proc-475-99 ◽

1997 ◽

Vol 475 ◽

Author(s):

G.J. Strijkers ◽

H.J.M. Swagten ◽

A.H.M. Mettler ◽

M.M.H. Willekens ◽

W.J.M. De Jonge

Keyword(s):

Giant Magnetoresistance ◽

Spin Valve ◽

Short Length ◽

Spin Valves ◽

Length Scale ◽

Magnetic Layers ◽

Ferromagnetic Layers ◽

Experimental Tool ◽

Spin Dependent Scattering

ABSTRACTWe introduce an interface selective structure, composed of a spin-valve on top of which a thick nonmagnetic back layer is deposited as a straightforward experimental tool to measure the GMR induced by ultrathin magnetic layers. The interface selectivity of spin-dependent scattering is evidenced by calculations and illustrated in both Co/Cu/Co and Ni80Fe20/Cu/Ni80Fe20 spin-valves by an almost discontinuous behavior in the GMR ratio. The temperture dependence of the extremely short length scale associated with this discontinuity is discussed in relation to the structure of ultrathin ferromagnetic layers.

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DEPENDENCE OF GIANT MAGNETORESISTANCE ON THE THICKNESS OF MAGNETIC AND NON-MAGNETIC LAYERS IN DUAL SPIN VALVES

Modern Physics Letters B ◽

10.1142/s0217984904006949 ◽

2004 ◽

Vol 18 (09) ◽

pp. 355-365 ◽

Cited By ~ 2

Author(s):

YONG WANG ◽

MING XU ◽

ZHENHONG MAI

Keyword(s):

Giant Magnetoresistance ◽

Classical Model ◽

Spin Valve ◽

Magnetic Layer ◽

Spin Valves ◽

Experimental Result ◽

Magnetic Layers ◽

Ferromagnetic Layers ◽

Hole Effect ◽

Good Agreement

Based on the previous semi-classical model, we have performed calculation of the giant magnetoresistance (GMR) as a function of the thickness of the top/bottom or center ferromagnetic layers and the non-magnetic layer in dual spin valves. Our results are in good agreement with that reported in experiment, i.e., a GMR maximum is observed when the thickness of the top/bottom magnetic layer is at 20 ~ 40 Å; the GMR value decreases monotonically with the increase of the non-magnetic layer thickness. By considering the "pin-hole" effect, the variation of GMR versus the thickness of the center magnetic layer is also found to be consistent with the experimental result. These calculations will be helpful in the design of high-quality spin-valve structures.

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Micromagnetics Simulation of Asymmetric Pseudo-Spin Valve Dots

MRS Proceedings ◽

10.1557/proc-731-w5.7 ◽

2002 ◽

Vol 731 ◽

Cited By ~ 1

Author(s):

N. Dao ◽

C. A. Ross ◽

F. J. Castaño ◽

M. J. Donahue ◽

S. L. Whittenburg

Keyword(s):

Magnetization Reversal ◽

Reasonable Agreement ◽

Domain Walls ◽

Spin Valve ◽

Experimental Results ◽

Soft Layer ◽

Aspect Ratios ◽

Magnetic Layers ◽

Simulation Results ◽

Present Simulation

AbstractWe present simulation results for Ni79Fe21 (5 nm)/Cu (3 nm)/Co (4nm) pseudo-spin valves. These simulations have been conducted on several different aspect ratios of rectangular dots. Distinct switches of the two magnetic layers were observed. At smaller aspect ratios, magnetization reversal proceeds through a leaf state in the soft layer and a flower state in the hard layer. For larger aspect ratios, reversal proceeds by nucleation and annihilation of domain walls. Our simulations show a reasonable agreement with the experimental results. Differences between the experimental and simulation results are discussed.

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Experimental study of magnetization reversal processes in nonsymmetric spin valve

Journal of Applied Physics ◽

10.1063/1.364954 ◽

1997 ◽

Vol 81 (8) ◽

pp. 5215-5217 ◽

Cited By ~ 18

Author(s):

V. S. Gornakov ◽

V. I. Nikitenko ◽

L. H. Bennett ◽

H. J. Brown ◽

M. J. Donahue ◽

...

Keyword(s):

Experimental Study ◽

Magnetization Reversal ◽

Spin Valve

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Особенности перемагничивания обменно-связанных пленочных структур Tb-Co/FeNi в температурном интервале, включающем точку компенсации ферримагнитного слоя

Физика твердого тела ◽

10.21883/ftt.2021.09.51238.34h ◽

2021 ◽

Vol 63 (9) ◽

pp. 1198

Author(s):

А.В. Свалов ◽

В.Н. Лепаловский ◽

Е.А. Степанова ◽

И.А. Макарочкин ◽

В.О. Васьковский ◽

...

Keyword(s):

Magnetic Properties ◽

Magnetron Sputtering ◽

Exchange Interaction ◽

Wide Temperature Range ◽

Magnetization Reversal ◽

Compensation Temperature ◽

Zeeman Energy ◽

Temperature Range ◽

Interlayer Exchange

The magnetic properties of exchange-coupled Tb-Co/FeNi film structures obtained by magnetron sputtering were studied in a wide temperature range. It was shown that a decrease in the Zeeman energy when approaching the compensation temperature of the ferrimagnetic layer was accompanied by a change in the sequence of magnetization reversal of the layers. The efficiency of the interlayer exchange interaction varies with temperature very little.

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ADDENDUM: DEPENDENCE OF GIANT MAGNETORESISTANCE ON THE THICKNESS OF MAGNETIC AND NON-MAGNETIC LAYERS IN DUAL SPIN VALVES

Modern Physics Letters B ◽

10.1142/s0217984904007980 ◽

2004 ◽

Vol 18 (28n29) ◽

pp. 1479-1479

Author(s):

YONG WANG ◽

MING XU ◽

ZHENHONG MAI

Keyword(s):

Giant Magnetoresistance ◽

Spin Valves ◽

Magnetic Layers

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Gate-tunable high magnetoresistance in monolayer Fe3GeTe2 spin valves

Physical Chemistry Chemical Physics ◽

10.1039/d0cp03761c ◽

2020 ◽

Vol 22 (44) ◽

pp. 25730-25739

Author(s):

Jie Yang ◽

Ruge Quhe ◽

Shiqi Liu ◽

Yuxuan Peng ◽

Xiaotian Sun ◽

...

Keyword(s):

Spin Valve ◽

Spin Valves ◽

Ferromagnetic Electrodes

Here we design a monolayer Fe3GeTe2 spin-valve device by attaching two ends to ferromagnetic electrodes. A high magnetoresistance of ~ 390% is obtained and significantly increased to 450 ~ 510% after the gates are introduced.

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