Electrodeposited Magnetic Multilayers

1996 ◽  
Vol 451 ◽  
Author(s):  
W. Schwarzacher ◽  
M. Alper ◽  
R. Hart ◽  
G. Nabiyouni ◽  
I. Bakonyi ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Giant Magnetoresistance ◽  
Single Layer ◽  
Multilayer Films ◽  
Magnetic Multilayers ◽  
Magnetic Multilayer ◽  
Cu Film ◽  
Magnetic Metal ◽  
Cu Foil

ABSTRACTElectrodeposited magnetic multilayer films consisting of alternating layers of a ferromagnetic and a non-magnetic metal may exhibit giant magnetoresistance (GMR), but the effect is very sensitive to whether deposition is carried out under potentiostatic or galvanostatic control, and the choice of substrate. The texture of Co-Ni-Cu/Cu superlattices grown on polycrystalline (100)-textured Cu plates and (HO)-textured Cu foil under potentiostatic control depended on that of the substrate, while comparable superlattices grown under galvanostatic control had a predominantly (111) texture. The films grown under galvanostatic control generally exhibit AMR or smaller GMR. The magnetic and magnetotransport properties of Co-Ni-Cu/Cu superlattices and a single-layer Co-Ni-Cu film electrodeposited directly onto n-GaAs (100) are also described, and evidence is presented for an in-plane magnetic anisotropy in these samples.

Giant Magnetoresistance in Single Layer and Multilayer Phase Separating Alloy Films

1993 ◽  
Vol 313 ◽  
Author(s):  
S. Hossain ◽  
A. Waknis ◽  
D. Seale ◽  
M. Tan ◽  
M.R. Parker ◽  
...  
Keyword(s):  
Thin Films ◽  
Field Dependence ◽  
Giant Magnetoresistance ◽  
Room Temperature ◽  
Single Layer ◽  
Multilayer Films ◽  
Equilibrium Conditions ◽  
Ferromagnetic Layers ◽  
Novel Processing ◽  
New Phase

ABSTRACTThe phenomenon of giant magnetoresistance (GMR), previously measured only in multilayer films comprising ferromagnetic layers separated by nonmagnetic spacers, has recently been observed in single layer ‘granular’ alloy thin films prepared by cosputtering a ferromagnet and a nonmagnet which tend to phase separate (cluster) under equilibrium conditions. We have systematically studied the magnetoresistance of two new phase separating GMR systems (Ni66Fe16Co18-Ag and Co9oFelo-Ag) both of which exhibit large room temperature GMR (>11% and >14%, respectively). We have also attempted to influence the details of the field dependence of the magnetoresistance in the previously studied Co-Ag system by employing novel processing methods including interrupted sputtering and layering of the Co-Ag alloy with Cu spacers.

CORRELATION BETWEEN THE POTENTIAL CONTRIBUTION AND MAGNETIC TRANSPORT PROPERTIES FOR MAGNETIC MULTILAYERS

1999 ◽  
Vol 13 (11) ◽  
pp. 1437-1446
Author(s):  
LING-YUN ZHANG ◽  
HONG SUN ◽  
BO-ZANG LI ◽  
FU-CHO PU
Keyword(s):  
Transport Properties ◽  
Giant Magnetoresistance ◽  
Impurity Scattering ◽  
Potential Effect ◽  
Magnetic Multilayers ◽  
Exchange Potential ◽  
Potential Contribution ◽  
Magnetic Multilayer ◽  
Scattering Potential ◽  
Magnetic Transport

We discuss the exchange potential and impurity scattering potential effect on the magnetic transport properties of magnetic multilayers. In the case of Hartree–Fork approximation, the model Hamiltonian with respect to the magnetization and potential contribution is presented. The expression of giant magnetoresistance is obtained by considering both interface and bulk magnetization contribution. The results show that the giant magnetoresistance in magnetic multilayer is different for different layer thickness. Meanwhile, we also clarify the interface and bulk contribution of the giant magnetoresistance in magnetic multilayer for different exchange potential and impurity scattering potential.

scholarly journals Multiple Walker Breakdowns in Magnetic Multilayers

2021 ◽  
Author(s):  
Joon Moon ◽  
Jaesung Yoon ◽  
Kitae Kim ◽  
Seong-Hyub Lee ◽  
Dae-Yun Kim ◽  
...  
Keyword(s):  
Domain Wall ◽  
Domain Walls ◽  
Multilayer Films ◽  
Magnetic Multilayers ◽  
Magnetic Multilayer ◽  
Phase Boundaries ◽  
Domain Wall Dynamics ◽  
Domain Wall Velocity ◽  
Magnetic Layers ◽  
Magnetic Dipole Field

Abstract Herein, we report an exotic domain-wall dynamics showing double Walker breakdowns in magnetic multilayer films composed of two magnetic layers. Such multiple Walker breakdowns are attributed to the internal magnetic dipole field, which is antisymmetric on the domain walls of the lower and upper magnetic layers. A micromagnetic simulation shows four phases of the domain-wall dynamics, which result in a phase diagram with the phase boundaries of the double Walker breakdown fields. Such double Walker breakdowns lead to two minima in the variation of the domain-wall velocity, as often observed experimentally.

TEM Study of Co/Pd and Co/Au Multilayers

1993 ◽  
Vol 51 ◽  
pp. 1036-1037
Author(s):  
A.E.M. De Veirman ◽  
F.J.G. Hakkens ◽  
W.M.J. Coene ◽  
F.J.A. den Broeder
Keyword(s):  
Magnetic Anisotropy ◽  
Ion Beam ◽  
Perpendicular Magnetic Anisotropy ◽  
Optical Recording ◽  
Magnetic Multilayer ◽  
Ion Beam Sputtering ◽  
Cross Sectional ◽  
Transmission Electron ◽  
Beam Sputtering ◽  
Substrate Temperatures

There is currently great interest in magnetic multilayer (ML) thin films (see e.g.), because they display some interesting magnetic properties. Co/Pd and Co/Au ML systems exhibit perpendicular magnetic anisotropy below certain Co layer thicknesses, which makes them candidates for applications in the field of magneto-optical recording. It has been found that the magnetic anisotropy of a particular system strongly depends on the preparation method (vapour deposition, sputtering, ion beam sputtering) as well as on the substrate, underlayer and deposition temperature. In order to get a better understanding of the correlation between microstructure and properties a thorough cross-sectional transmission electron microscopy (XTEM) study of vapour deposited Co/Pd and Co/Au (111) MLs was undertaken (for more detailed results see ref.).The Co/Pd films (with fixed Pd thickness of 2.2 nm) were deposited on mica substrates at substrate temperatures Ts of 20°C and 200°C, after prior deposition of a 100 nm Pd underlayer at 450°C.

Introduction of spin torques

2017 ◽  
Author(s):  
T. Kimura
Keyword(s):  
Angular Momentum ◽  
Giant Magnetoresistance ◽  
Spontaneous Magnetization ◽  
Magnetic Domain ◽  
Magnetic Multilayers ◽  
Transfer Effect ◽  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Spin Angular Momentum ◽  
Spin Torques

This chapter discusses the spin-transfer effect, which is described as the transfer of the spin angular momentum between the conduction electrons and the magnetization of the ferromagnet that occurs due to the conservation of the spin angular momentum. L. Berger, who introduced the concept in 1984, considered the exchange interaction between the conduction electron and the localized magnetic moment, and predicted that a magnetic domain wall can be moved by flowing the spin current. The spin-transfer effect was brought into the limelight by the progress in microfabrication techniques and the discovery of the giant magnetoresistance effect in magnetic multilayers. Berger, at the same time, separately studied the spin-transfer torque in a system similar to Slonczewski’s magnetic multilayered system and predicted spontaneous magnetization precession.

Perpendicular giant magnetoresistance of microstructured pillars in FeCr and CoCu magnetic multilayers

1995 ◽  
Vol 31 (1-2) ◽  
pp. 85-92 ◽  
Author(s):  
M.A.M. Gijs ◽  
S.K.J. Lenczowski ◽  
J.B. Giesbers ◽  
R.J.M. van de Veerdonk ◽  
M.T. Johnson ◽  
...  
Keyword(s):  
Giant Magnetoresistance ◽  
Magnetic Multilayers
Sign in / Sign up

Export Citation Format

Share Document