Stress effects on exchange coupling field, coercivity, and uniaxial anisotropy field of NiO/NiFe bilayer thin film for spin valves

1997 ◽  
Vol 81 (8) ◽  
pp. 4519-4521 ◽  
Author(s):  
De-Hua Han ◽  
Jian-Gang Zhu ◽  
Jack H. Judy ◽  
John M. Sivertsen
Keyword(s):  
Thin Film ◽  
Exchange Coupling ◽  
Uniaxial Anisotropy ◽  
Anisotropy Field ◽  
Spin Valves ◽  
Coupling Field ◽  
Stress Effects

Effect of stress on exchange coupling field, coercivity, and uniaxial anisotropy field of NiFe/NiO bilayer thin films

1997 ◽  
Vol 70 (5) ◽  
pp. 664-666 ◽  
Author(s):  
De-Hua Han ◽  
Jian-Gang Zhu ◽  
Jack H. Judy ◽  
John M. Sivertsen
Keyword(s):  
Thin Films ◽  
Exchange Coupling ◽  
Uniaxial Anisotropy ◽  
Anisotropy Field ◽  
Coupling Field

scholarly journals Dynamics of Magnetization in Multilayer TbCo / FeCo Structures under the Influence of Femtosecond Optical Excitation

2019 ◽  
Vol 7 (3) ◽  
pp. 50-58 ◽  
Author(s):  
N. A. Ilyin ◽  
A. A. Klimov ◽  
N. Tiercelin ◽  
P. Pernod ◽  
E. D. Mishina ◽  
...  
Keyword(s):  
Easy Axis ◽  
Uniaxial Anisotropy ◽  
Anisotropy Field ◽  
Optical Excitation ◽  
Spin Precession ◽  
Heat Diffusion ◽  
Easy Magnetization ◽  
Test Beam ◽  
Magnetic Subsystem ◽  
Hard Axis

The need to study ultrafast processes in magnetism is due to the prospects for creating ultrafast magnetic recording and ultrafast spintronic devices. In order to excite the magnetic subsystem femtosecond optical pulses are used. The excitement is manifested as in spin precession. In metals, the material is heated first due to significant optical absorption, and significant Joule losses occur. The most important task is to search for materials in which spin processes are excited without heating. Obvious candidates are weakly absorbing materials, such as ferrite garnets. However, the range of such materials and the range of their functionality are limited.The purpose of this work is to study the dynamics of systems with nonthermal mechanisms of spin precession excitation. Such excitation is possible in ferromagnetic / antiferromagnetic heterostructures with exchange interaction, provided that the recombination time of photocarriers is shorter than the time of heat diffusion. Multilayer TbCo / FeCo structures of the near IR range were investigated for a femtosecond optical pulse. The spin dynamics are compared with the direction of the wave vector of the exciting pulse along and perpendicular to the axis of easy magnetization of the structures (“easy axis” and “hard axis” geometry, respectively). It is shown that in case of “easy axis” geometry the determinative mechanism is the thermal interaction. When the system is exposed to an excitation pulse, this mechanism leads to a decrease in the projection of magnetization on the direction of propagation of the test beam. In case of “hard axis” geometry, the magnetization turns to the magnetic field at the initial stage. Then it precesses and relaxes to an equilibrium angular orientation. Such dynamics indicate a rapid recovery of the uniaxial anisotropy field after laser irradiation. The presented results demonstrate an ultrafast change in the magnetic anisotropy induced during the fabrication of the heterostructure under study, which may be of interest for optical control of the orientation of the magnetization.

scholarly journals Exchange-Coupling Field of MgO/Cr70Al30/Fe19Ni81 Films on (100) Si

1998 ◽  
Vol 22 (S_1_ISFA_97) ◽  
pp. S1_239-241 ◽  
Author(s):  
K. IKARASHI ◽  
Y. OTANI ◽  
K. FUKAMICHI ◽  
O. KITAKAMI ◽  
Y. SHIMADA ◽  
...  
Keyword(s):  
Exchange Coupling ◽  
Coupling Field

PHASE EVOLUTION AND MAGNETIC PROPERTIES OF TbCu7-TYPE (Sm, Pr)Co7-xHfxMy (x = 0-0.5; y = 0-0.14) RIBBONS

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1663-1669 ◽  
Author(s):  
H. W. Chang ◽  
S. T. Huang ◽  
I. W. Chen ◽  
C. W. Chang ◽  
W. C. Chang
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Exchange Coupling ◽  
Coupling Effect ◽  
Anisotropy Field ◽  
Phase Evolution ◽  
Phase Constitution ◽  
Melt Spun

The effects of Hf substitution and C content on the magnetic properties, phase evolution, and microstructure of melt spun ( Sm , Pr ) Co 7- x Hf x C y ( x = 0-0.5; y = 0-0.14) ribbons have been studied. A proper Hf substitution is helpful not only in stabilizing 1:7 phase but also in enhancing its magnetic anisotropy field. As a result, magnetic properties of B r = 6.4 kG , i H c = 7.3 kOe and ( BH ) max = 8.7 MGOe for SmCo 6.9 Hf 0.1 ribbons are obtained. Besides, a small amount of C addition in the ribbons could slightly modify phase constitution and effectively refine their microstructure to strengthen the exchange coupling effect between magnetic grains. Furthermore, a slight Pr substitution for Sm may further increase the magnetization and the magnetic properties of the ribbons. The optimal magnetic properties of B r = 7.1 kG , i H c = 8.5 kOe and ( BH ) max = 11.2 MGOe could be achieved for the directly quenched Sm 0.8 Pr 0.2 Co 6.9 Hf 0.1 C 0.12 ribbons.

Large exchange coupling field in perpendicular synthetic antiferromagnetic structures with CoPt alloy

2018 ◽  
Vol 57 (8) ◽  
pp. 088004 ◽  
Author(s):  
Takahiro Ogasawara ◽  
Mikihiko Oogane ◽  
Masakiyo Tsunoda ◽  
Yasuo Ando
Keyword(s):  
Exchange Coupling ◽  
Coupling Field
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