Mössbauer study of Ba ferrite sputtered films with large saturation magnetization and perpendicular magnetic anisotropy constant (abstract)

1997 ◽  
Vol 81 (8) ◽  
pp. 5137-5137 ◽  
Author(s):  
K. Noma ◽  
N. Matsushita ◽  
S. Nakagawa ◽  
M. Naoe
Keyword(s):  
Magnetic Anisotropy ◽  
Saturation Magnetization ◽  
Perpendicular Magnetic Anisotropy ◽  
Anisotropy Constant ◽  
Mössbauer Study ◽  
Sputtered Films ◽  
Magnetic Anisotropy Constant

scholarly journals Температурные изменения магнитной структуры мультиферроика BiFe-=SUB=-0.80-=/SUB=-Cr-=SUB=-0.20-=/SUB=-O-=SUB=-3-=/SUB=-

2019 ◽  
Vol 61 (6) ◽  
pp. 1107
Author(s):  
В.С. Русаков ◽  
В.С. Покатилов ◽  
А.С. Сигов ◽  
А.А. Белик ◽  
М.Е. Мацнев
Keyword(s):  
Magnetic Anisotropy ◽  
Temperature Dependence ◽  
Spin Wave ◽  
Easy Axis ◽  
Anisotropy Constant ◽  
Paramagnetic State ◽  
Mössbauer Study ◽  
Magnetic Anisotropy Constant ◽  
Effective Magnetic Anisotropy ◽  
Anharmonicity Parameter

AbstractThe results of a Mössbauer study of the magnetic structure of multiferroic BiFe_0.80Cr_0.20O_3 in the temperature range of 5–550 K are presented. It is found that a collinear antiferromagnetic structure of the G type is present in BiFe_0.80Cr_0.20O_3 at temperatures below 260 K. Above 260 K, an anharmonic spin wave with a magnetic anisotropy of the easy-axis type with a high value of the anharmonicity parameter m arises. With a further increase in the temperature, the m parameter decreases and tends to zero at T ~ 420 K, at which a harmonic spin wave comes into existence. Above a temperature of about 420 K, the m parameter increases again and the spin wave becomes anharmonic with an easy-plane magnetic anisotropy. At the Néel temperature, T _N = 505 ± 10 K, the sample undergoes a transition from the magnetically ordered to the paramagnetic state. The change in the type of magnetic anisotropy at T ~ 420 K is explained by competing contributions of different signs to the effective magnetic anisotropy constant and their different temperature dependence for the BiFe_0.80Cr_0.20O_3 multiferroic.

Magnetic Anisotropy in [Pt/Co]4/MgO/[Co/Pt]2 Multilayers

2019 ◽  
Vol 944 ◽  
pp. 625-630
Author(s):  
Qian Li ◽  
Lei Li ◽  
Wei Zhou ◽  
Jun Chen ◽  
Si Yuan Zhang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Anisotropy ◽  
Perpendicular Magnetic Anisotropy ◽  
Interlayer Coupling ◽  
Periodic Variation ◽  
Anisotropy Constant ◽  
Soft Layer ◽  
Magnetic Anisotropy Constant ◽  
Extraordinary Hall Effect ◽  
The Magnetic Field

A serial of [Pt/Co]4/MgO/[Co/Pt]2multilayers were prepared by magnetron sputtering in this study and Antiferromagnetic (AF) interlayer coupling was observed with increasing MgO spacer thickness. Perpendicular magnetic anisotropy of soft layer in [Pt/Co]4/MgO/[Co/Pt]2multilayers were measured by Extraordinary Hall Effect (EHE). The direction of the magnetic field was parallel to the direction of the current. The results revealed that perpendicular magnetic anisotropy constant Kuoscillates with the thickness of MgO layer which is between 1.3 to 3.3 nm. The period of this oscillation is about 0.43 nm. This is very close to the monolayer (100) MgO. With increasing MgO spacer, the periodic variation of interface between [Pt/Co]nand MgO layer may be one of the reasons for this oscillation behavior of Ku.

scholarly journals Магнитная анизотропия игольчатых монокристаллических включений MnSb в матрице InSb

2021 ◽  
Vol 47 (10) ◽  
pp. 46
Author(s):  
А.И. Дмитриев ◽  
А.В. Кочура ◽  
С.Ф. Маренкин ◽  
E. Lahderanta ◽  
А.П. Кузьменко ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Single Crystal ◽  
Saturation Magnetization ◽  
Power Law ◽  
Anisotropy Constant ◽  
Temperature Range

The magnetic anisotropy of needle-like single-crystal MnSb inclusions in the InSb matrix was determined and studied in the temperature range 5 – 350 K. In granular InSb-MnSb samples a power-law dependence of the anisotropy constant K(T) on the saturation magnetization MS(T) is observed in the temperature range 5 – 350 K with an exponent n = 3.2 ± 0.4 in accordance with the theories developed by Akulov, Zener, and Callens.

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