Determination of the Surface Anisotropy Contribution to the Magnetic Anisotropy Field of a Nanocrystalline Barium Ferrite Powder at Various Temperatures

2005 ◽  
Vol 47 (7) ◽  
pp. 1306 ◽  
Author(s):  
L. P. Ol’khovik
Keyword(s):  
Magnetic Anisotropy ◽  
Barium Ferrite ◽  
Anisotropy Field ◽  
Ferrite Powder ◽  
Surface Anisotropy

scholarly journals Возможности магнитного псевдорезонанса в изучении тонких ферромагнитных пленок с одноосной магнитной анизотропией

2019 ◽  
Vol 89 (1) ◽  
pp. 72
Author(s):  
В.В. Демидов ◽  
А.Е. Мефёд
Keyword(s):  
Magnetic Anisotropy ◽  
Anisotropy Field ◽  
Resonance Peak ◽  
Easy Magnetization Axis ◽  
Easy Magnetization ◽  
Additional Information ◽  
Ferromagnetic Films ◽  
Magnetization Axis ◽  
X Band

AbstractPossibilities of magnetic pseudoresonance (a non-resonance peak of magnetic susceptibility) were studied and compared with the ferromagnetic resonance (FMR) in measuring the parameters of thin ferromagnetic films with in-plane uniaxial magnetic anisotropy. The measurements were conducted with two characteristic samples of ferromagnetic films showing this effect. A Q -meter operating at a frequency near 300 MHz (for pseudoresonance) and a standard X -band magnetic resonance spectrometer (for FMR) were used. The Q -meter working at 300 MHz was shown to detect reliably the magnetic pseudoresonance in both epitaxial and polycrystalline films. It was found that the accuracy of determination of the magnetic anisotropy field and orientation of the easy magnetization axis provided by the pseudoresonance method is as good as with FMR, and in some cases the pseudoresonance method gives additional information.

Magnetism and liquid crystals

1987 ◽  
Vol 65 (10) ◽  
pp. 1185-1193 ◽  
Author(s):  
A. J. Dekker
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
Liquid Crystals ◽  
Magnetic Anisotropy ◽  
Elastic Constants ◽  
Landau Theory ◽  
Anisotropy Field ◽  
Isotropic Phase ◽  
Magnetic Field Effects

Superficial similarities and essential differences between nematic liquid crystals and magnetically ordered systems as well as some magnetic-field effects in nematics are recalled. Magnetic anisotropy, field alignment, and the determination of elastic constants of nematics are discussed briefly. Landau theory is used to discuss the effect of a magnetic field on the nematic-isotropic phase transition; the predictions are compared with experiment.

scholarly journals Route towards efficient magnetization reversal driven by voltage control of magnetic anisotropy

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Roxana-Alina One ◽  
Hélène Béa ◽  
Sever Mican ◽  
Marius Joldos ◽  
Pedro Brandão Veiga ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Random Access ◽  
Low Power Consumption ◽  
Surface Anisotropy ◽  
Magnetization Dynamics ◽  
Storage Density ◽  
Switching Regime ◽  
Major Interest ◽  
Out Of Plane

AbstractThe voltage controlled magnetic anisotropy (VCMA) becomes a subject of major interest for spintronics due to its promising potential outcome: fast magnetization manipulation in magnetoresistive random access memories with enhanced storage density and very low power consumption. Using a macrospin approach, we carried out a thorough analysis of the role of the VCMA on the magnetization dynamics of nanostructures with out-of-plane magnetic anisotropy. Diagrams of the magnetization switching have been computed depending on the material and experiment parameters (surface anisotropy, Gilbert damping, duration/amplitude of electric and magnetic field pulses) thus allowing predictive sets of parameters for optimum switching experiments. Two characteristic times of the trajectory of the magnetization were analyzed analytically and numerically setting a lower limit for the duration of the pulses. An interesting switching regime has been identified where the precessional reversal of magnetization does not depend on the voltage pulse duration. This represents a promising path for the magnetization control by VCMA with enhanced versatility.

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.

Structural, surface morphology and radiation shielding properties of barium ferrite powder

2021 ◽  
Author(s):  
Atif Mossad Ali ◽  
Shams A M Issa ◽  
H Algarni ◽  
Huseyin Ozan O. Tekin ◽  
Hesham M.H. Zakaly ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Barium Ferrite ◽  
Radiation Shielding ◽  
Ferrite Powder ◽  
Structural Surface ◽  
Shielding Properties
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