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

Exchange coupling-induced uniaxial anisotropy in La 0.7 Sr 0.3 MnO 3 thin films

2016 ◽  
Vol 61 (2) ◽  
pp. 157-162 ◽  
Author(s):  
Liang Wu ◽  
Jing Ma ◽  
Ji Ma ◽  
Yujun Zhang ◽  
Ya Gao ◽  
...  
Keyword(s):  
Thin Films ◽  
Exchange Coupling ◽  
Uniaxial Anisotropy

Electrical Anisotropy of Thin Metal Films Growing on Dielectric Substrates

2002 ◽  
Vol 7 (2) ◽  
pp. 45-52
Author(s):  
L. Jakučionis ◽  
V. Kleiza
Keyword(s):  
Magnetic Field ◽  
Thin Films ◽  
Uniaxial Anisotropy ◽  
Metal Films ◽  
Thin Layers ◽  
Electrical Anisotropy ◽  
Electrical Field ◽  
Dielectric Substrates ◽  
Unequal Probability ◽  
Conductive Thin Films

Electrical properties of conductive thin films, that are produced by vacuum evaporation on the dielectric substrates, and which properties depend on their thickness, usually are anisotropic i.e. they have uniaxial anisotropy. If the condensate grow on dielectric substrates on which plane electrical field E is created the transverse voltage U⊥ appears on the boundary of the film in the direction perpendicular to E. Transverse voltage U⊥ depends on the angle γ between the applied magnetic field H and axis of light magnetisation. When electric field E is applied to continuous or grid layers, U⊥ and resistance R of layers are changed by changing γ. It means that value of U⊥ is the measure of anisotropy magnitude. Increasing voltage U0 , which is created by E, U⊥ increases to certain magnitude and later decreases. The anisotropy of continuous thin layers is excited by inequality of conductivity tensor components σ0 ≠ σ⊥. The reason of anisotropy is explained by the model which shows that properties of grain boundaries are defined by unequal probability of transient of charge carrier.

Effect of coupling on magnetic properties of uniaxial anisotropy NiFeCo/TaN/NiFeCo sandwich thin films

1994 ◽  
Vol 76 (10) ◽  
pp. 6986-6988 ◽  
Author(s):  
T. Yeh ◽  
L. Berg ◽  
B. Witcraft ◽  
J. Falenschek ◽  
J. Yue
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Uniaxial Anisotropy

On the origin of uniaxial anisotropy in permalloy thin films

1968 ◽  
Vol 4 (3) ◽  
pp. 515-519 ◽  
Author(s):  
T. Fujii ◽  
S. Uchiyama ◽  
M. Masuda ◽  
Y. Sakaki
Keyword(s):  
Thin Films ◽  
Uniaxial Anisotropy ◽  
Permalloy Thin Films

Magnetic Tuning of Biquadratic Exchange Coupling in Magnetic Thin Films

2003 ◽  
Vol 91 (9) ◽  
Author(s):  
Andreas Moser ◽  
Andreas Berger ◽  
David T. Margulies ◽  
Eric E. Fullerton
Keyword(s):  
Thin Films ◽  
Exchange Coupling ◽  
Magnetic Thin Films ◽  
Biquadratic Exchange ◽  
Magnetic Tuning

Effect of Thickness on Mechanically Tunable Magnetic Anisotropy of FeGa Thin Films Deposited on Flexible Substrates

2015 ◽  
Vol 815 ◽  
pp. 227-232 ◽  
Author(s):  
Ying Yu ◽  
Shu Hong Xie ◽  
Qing Feng Zhan
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Effective Strain ◽  
Anisotropy Field ◽  
Saturation Field ◽  
Effective Anisotropy ◽  
Magnetostriction Constant ◽  
The Difference ◽  
Different Strains

A practical way to manipulate the magnetic anisotropy of magnetostrictive FeGa thin films grown on flexible polyethylene terephthalate (PET) substrates is introduced in this study. The effect of film thickness on magnetic properties and magnetostriction constant of polycrystalline FeGa thin films was investigated. The anisotropy field Hk of flexible FeGa films, i.e., the saturation field determined by fitting the hysteresis curves measured along the hard axis, was enhanced with increasing the tensile strain applied along the easy axis of the thin films, but this enhancement via strain became unconspicuous with increasing the thickness of FeGa films. In order to study the magnetic sensitivity of thin films responding to the external stress, we applied different strains on these films and measure the corresponding anisotropy field. Moreover, the effective magnetostriction constant of FeGa films was calculated from the changes of both anisotropy field and external strain based on the Villari effect. A Neel’s phenomenological model was developed to illustrate that the effective anisotropy field of FeGa thin films was contributed from both the constant volume term and the inverse thickness dependent surface term. Therefore, the magnetic properties for the volume and surface of FeGa thin films were different, which has been verified in this work by using vibrating sample magnetometer (VSM) and magneto-optic Kerr effect (MOKE) system. The anisotropy field contributed by the surface of FeGa film and obtained by MOKE is smaller than that contributed by the film volume and measured by VSM. We ascribed the difference in Hk to the relaxation of the effective strain applied on the films with increasing the thickness of films.

Exchange Bias in CrO2/Cr2O3 Bilayer Thin Films

2006 ◽  
Vol 45 ◽  
pp. 2528-2533 ◽  
Author(s):  
S. Srinath ◽  
N.A. Frey ◽  
H. Srikanth ◽  
G.X. Miao ◽  
A. Gupta
Keyword(s):  
Thin Films ◽  
Magnetic Anisotropy ◽  
Variable Thickness ◽  
Exchange Bias ◽  
Exchange Coupling ◽  
Hysteresis Loops ◽  
Anisotropy Constant ◽  
Effective Magnetic Anisotropy ◽  
Large Anisotropy

We have investigated the exchange bias in CVD grown epitaxial CrO2/Cr2O3 bilayer thin films using hysteresis loops and resonant RF transverse susceptibility. M-H loops indicated an enhanced coercivity without appreciable loop shift and the transverse susceptibility in CrO2/Cr2O3 bilayers revealed features associated with both the ferromagnetic and antiferromagnetic phases. In addition, TS yielded large anisotropy constant (Keff) values depending on the fraction of Cr2O3 present. The large anisotropy fields observed cannot be accounted for by the variable thickness of CrO2 alone and are indicative of possible exchange coupling between CrO2 and Cr2O3 phases that significantly affects the effective magnetic anisotropy.

Magnetic memory in ferromagnetic thin films via exchange coupling

2008 ◽  
Vol 78 (13) ◽  
Author(s):  
K. Chesnel ◽  
E. E. Fullerton ◽  
M. J. Carey ◽  
J. B. Kortright ◽  
S. D. Kevan
Keyword(s):  
Thin Films ◽  
Exchange Coupling ◽  
Magnetic Memory ◽  
Ferromagnetic Thin Films
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