Magnetic properties of thin hard/soft-stacked dot arrays with a large uniaxial magnetic anisotropy

2009 ◽  
Vol 105 (7) ◽  
pp. 07C103 ◽  
Author(s):  
K. Mitsuzuka ◽  
T. Shimatsu ◽  
N. Kikuchi ◽  
O. Kitakami ◽  
H. Muraoka ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Uniaxial Magnetic Anisotropy

Magnetic anisotropy of Sm2Fe17−xGax hydrides

1993 ◽  
Vol 71 (11-12) ◽  
pp. 574-577 ◽  
Author(s):  
R. A. Dunlap ◽  
Z. Wang
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Room Temperature ◽  
Single Phase ◽  
Easy Axis ◽  
Phase 2 ◽  
Planar Anisotropy ◽  
Uniaxial Magnetic Anisotropy ◽  
Diffusion Of Hydrogen ◽  
Hard Magnetic Properties

The magnetic properties of single-phase 2:17 compounds of the composition Sm2Fe17−xGaxHy were investigated. The substitution of Ga for Fe in the Sm2Fe17 compound resulted in a substantial increase in the Curie temperature and, for alloys with x > 2, the formation of a uniaxial magnetic anisotropy at room temperature. The diffusion of hydrogen into those compounds that exhibit an easy axis anisotropy causes a transition back to a planar anisotropy. This indicates that the presence of interstitial hydrogen is detrimental to the hard magnetic properties of these materials.

scholarly journals Anomalous Nernst effect in stressed magnetostrictive film grown onto flexible substrate

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Acácio Silveira Melo ◽  
Alexandre Barbosa de Oliveira ◽  
Carlos Chesman ◽  
Rafael Domingues Della Pace ◽  
Felipe Bohn ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Electronic Devices ◽  
External Stress ◽  
Voltage Response ◽  
Nernst Effect ◽  
Uniaxial Magnetic Anisotropy ◽  
Thermoelectric Voltage ◽  
Magnetostrictive Film ◽  
Anomalous Nernst Effect

Abstract The anomalous Nernst effect in nanostructured magnetic materials is a key phenomenon to optimally control and employ the internal energy dissipated in electronic devices, being dependent on, for instance, the magnetic anisotropy of the active element. Thereby, here, we report a theoretical and experimental investigation of the magnetic properties and anomalous Nernst effect in a flexible magnetostrictive film with induced uniaxial magnetic anisotropy and under external stress. Specifically, we calculate the magnetization behavior and the thermoelectric voltage response from a theoretical approach for a planar geometry, with magnetic free energy density that takes into account the induced uniaxial and magnetoelastic anisotropy contributions. Experimentally, we verify modifications of the effective magnetic anisotropy by changing the external stress, and explore the anomalous Nernst effect, a powerful tool to investigate the magnetic properties of magnetostrictive materials. We find quantitative agreement between experiment and numerical calculations, thus elucidating the magnetic behavior and thermoelectric voltage response. Besides, we provide evidence to confirm the validity of the theoretical approach to describe the magnetic properties and anomalous Nernst effect in ferromagnetic magnetostrictive films having uniaxial magnetic anisotropy and submitted to external stress. Hence, the results place flexible magnetostrictive systems as promising candidates for active elements in functionalized touch electronic devices.

Effect of substrate temperature on structural, static and dynamic magnetic properties of FeSi/(001) MgO films

2021 ◽  
Author(s):  
Xiaobin Guo ◽  
Xiaoling Lu ◽  
Fengchao Su ◽  
Wenhai Qiu ◽  
Zheng Su ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Substrate Temperature ◽  
Magnetocrystalline Anisotropy ◽  
Practical Application ◽  
Radio Frequency Magnetron Sputtering ◽  
Uniaxial Magnetic Anisotropy ◽  
Maximum Value ◽  
Three Stages ◽  
Coercivity Field

Abstract FeSi films with different substrate temperature (Ts) were deposited on MgO (001) substrates by a radio frequency magnetron sputtering. During the change of crystal structure from amorphous epitaxial state, magnetic anisotropy experienced three stages: dominant uniaxial magnetic anisotropy (Ts < 400 ℃) and enhanced cubic magnetocrystalline anisotropy (400 ℃ £ Ts £ 600 ℃) and weak cubic magnetocrystalline anisotropy (Ts = 700 ℃ and 800 ℃). In addition, resonance frequency ƒr firstly decreases, then reaches the maximum value, and finally disappears due to the large coercivity field. These results demonstrate the correlation between the structure, static, dynamic magnetic properties of FeSi films, and provide an effective method to prepare soft films with deterministic uniaxial or cubic magnetic anisotropy for practical application.

Dynamics and magnetic properties of NO molecules encapsulated in open-cage fullerene derivatives evidenced by low temperature heat capacity

2021 ◽  
Author(s):  
Yoji Horii ◽  
Hal Suzuki ◽  
Yuji Miyazaki ◽  
Motohiro Nakano ◽  
Shota Hasegawa ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Magnetic Properties ◽  
Low Temperature ◽  
Magnetic Anisotropy ◽  
Fullerene Derivatives ◽  
Molecular Cages ◽  
Temperature Heat ◽  
Low Temperature Heat Capacity

Heat capacity analyses revealed dynamics and magnetic anisotropy of NO molecules confined in molecular cages.

Deciphering the influence of structural distortions on the uniaxial magnetic anisotropy of pentagonal bipyramidal Ni(ii) complexes

2019 ◽  
Vol 55 (77) ◽  
pp. 11547-11550
Author(s):  
Mamon Dey ◽  
Prashurya Pritam Mudoi ◽  
Anup Choudhury ◽  
Bipul Sarma ◽  
Nayanmoni Gogoi
Keyword(s):  
Magnetic Anisotropy ◽  
Structural Distortion ◽  
Uniaxial Magnetic Anisotropy ◽  
Simple Strategy ◽  
Structural Distortions

Role of structural distortion on the uniaxial magnetic anisotropy of pentagonal bipyramidal Ni(ii) complexes is explored. A simple strategy to enhance the uniaxial magnetic anisotropy in pentagonal bipyramidal Ni(ii) complexes is proposed.

Large Negative Uniaxial Magnetic Anisotropy in Epitaxially Strained Nickel Ferrite Films

2017 ◽  
Vol 53 (11) ◽  
pp. 1-4 ◽  
Author(s):  
Mitsuharu Matsumoto ◽  
Sonia Sharmin ◽  
Jun-ichiro Inoue ◽  
Eiji Kita ◽  
Hideto Yanagihara
Keyword(s):  
Magnetic Anisotropy ◽  
Nickel Ferrite ◽  
Uniaxial Magnetic Anisotropy ◽  
Ferrite Films

Ni thickness influence on magnetic properties (Co/Ni/Co/Pt) multilayers with perpendicular magnetic anisotropy

2017 ◽  
Vol 441 ◽  
pp. 585-589 ◽  
Author(s):  
R. Sbiaa ◽  
I.A. Al-Omari ◽  
M. Al Bahri ◽  
P.R. Kharel ◽  
M. Ranjbar ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Perpendicular Magnetic Anisotropy

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.

Perpendicular Magnetic Anisotropy in Pt/Co/AlO Trilayer Structures Depending on AlO Thickness and Fabrication Method

2014 ◽  
Vol 616 ◽  
pp. 247-251
Author(s):  
Tim Yang ◽  
Z.Q. Wang ◽  
Makoto Kohda ◽  
Takeshi Seki ◽  
Koki Takanashi ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetron Sputtering ◽  
Magnetic Anisotropy ◽  
Perpendicular Magnetic Anisotropy ◽  
Atomic Layer ◽  
Rf Magnetron Sputtering ◽  
Layer Deposition ◽  
Significant Damage ◽  
Arbitrary Thickness ◽  
High Kinetic Energy

We investigate the perpendicular magnetic anisotropy dependence on the AlO capping layer in Pt/Co/AlO films. AlO was deposited on Pt/Co films by RF magnetron sputtering and atomic layer deposition (ALD) with varying thickness. It is found that the prolonged deposition of thick AlO layers by RF magnetron sputtering causes significant damage to the Pt/Co underneath while AlO layers formed by ALD can be of arbitrary thickness with no damage to the magnetic properties of the films. The decline of the magnetic properties can be attributed to the method of AlO deposition for each process. In the RF magnetron sputtering, AlO atoms with high kinetic energy are ejected from a sputter target resulting in the degradation of Pt/Co films, while the process of deposition of AlO by ALD is governed by a series of chemically reactive condensations allowing for arbitrary deposition thickness of AlO.

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