scholarly journals Temperature dependence of magnetic anisotropy constant in iron chalcogenide Fe3Se4: Excellent agreement with theories

2012 ◽  
Vol 112 (10) ◽  
pp. 103905 ◽  
Author(s):  
Jun Wang ◽  
Hongyan Duan ◽  
Xiong Lin ◽  
Victor Aguilar ◽  
Aaron Mosqueda ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Temperature Dependence ◽  
Excellent Agreement ◽  
Anisotropy Constant ◽  
Iron Chalcogenide ◽  
Magnetic Anisotropy Constant

Temperature Behavior of Magnetization in Multiphase Co-P Powders in Unsaturated Regime

2015 ◽  
Vol 233-234 ◽  
pp. 522-525
Author(s):  
Oksana Anatoljevna Li ◽  
Sergey Viktorovich Komogortsev ◽  
Rauf S. Iskhakov ◽  
Lidia Aleksandrovna Chekanova ◽  
Evgeniy V. Eremin
Keyword(s):  
Magnetic Anisotropy ◽  
Temperature Dependence ◽  
Spontaneous Magnetization ◽  
Anisotropy Constant ◽  
Surprising Result ◽  
Zero Temperature ◽  
Bloch Constant ◽  
Magnetic Anisotropy Constant ◽  
Fitting Parameters ◽  
Good Agreement

In this paper we have proposed a modified expression for the fitting M(T) data in Co-P powders with nanocorundum and nanodiamond precipitates. The expression for M(T) takes into account the effects from both thermal magnetic excitations – Bloch’s T 3/2 law and temperature dependence of the magnetic anisotropy. The fitting parameters are spontaneous magnetization at absolute zero temperature, Bloch constant and order of magnetic anisotropy constant. The obtained Bloch constant is in good agreement with literature data. The order of magnetic anisotropy constant is found to be about 3 that is surprising result and supposedly comes from multiphase nature of the investigated Co-P powder.

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 of Helical and Collinear Magnets R2Fe17-XMnx

2010 ◽  
Vol 168-169 ◽  
pp. 192-195 ◽  
Author(s):  
Anatoly G. Kuchin
Keyword(s):  
Magnetic Anisotropy ◽  
Temperature Dependence ◽  
Spontaneous Magnetization ◽  
Anisotropy Constant ◽  
Easy Plane ◽  
Magnetic Anisotropy Constant ◽  
The Third ◽  
Plane Type ◽  
Experimental Variation ◽  
Increasing Temperature

Magnetic anisotropy of the easy-plane type in the R2Fe17-хMnx systems with R = Ce and Lu weakens upon substitution of Mn for Fe. Temperature dependence of the first magnetic anisotropy constant (K1) of the R2Fe17-xMnx systems is described rather well in the single-ion model of magnetic anisotropy. However, in the case of the Ce2Fe17-хMnx helical ferromagnets the experimental variation of K1 is somewhat slower than that calculated by the third power of the spontaneous magnetization, in contrast to the Lu2Fe17-хMnx collinear ferromagnets, where K1 decreases slightly faster with increasing temperature as compared with this fit.

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