scholarly journals Magnetite Nanocrystals with a High Magnetic Anisotropy Constant due to the Particle Shape

2019 ◽  
Vol 45 (9) ◽  
pp. 878-881 ◽  
Author(s):  
S. V. Stolyar ◽  
S. V. Komogortsev ◽  
L. A. Chekanova ◽  
R. N. Yaroslavtsev ◽  
O. A. Bayukov ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Particle Shape ◽  
Anisotropy Constant ◽  
Magnetic Anisotropy Constant ◽  
Magnetite Nanocrystals

scholarly journals Нанокристаллы магнетита с повышенной константой магнитной анизотропии, наведенной формой частицы

2019 ◽  
Vol 45 (17) ◽  
pp. 28
Author(s):  
С.В. Столяр ◽  
С.В. Комогорцев ◽  
Л.А. Чеканова ◽  
Р.Н. Ярославцев ◽  
О.А. Баюков ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Magnetic Anisotropy ◽  
High Aspect Ratio ◽  
Specific Volume ◽  
Anisotropy Constant ◽  
Magnetic Anisotropy Constant ◽  
Magnetite Particles ◽  
Co Precipitation ◽  
Magnetite Nanocrystals ◽  
Hysteresis Properties

Square-plated magnetite nanocrystals with a high aspect ratio (~ 1/9) are prepared by the co-precipitation from a solution in the presence of arabinogalactan. The magnetic anisotropy constant of particles is several times higher than the constant of spherical magnetite particles, which leads to increased hysteresis properties for specific volume of the particle.

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 Влияние дисперсии магнитной анизотропии кластеров Ge-=SUB=-3-=/SUB=-Mn-=SUB=-5-=/SUB=- на температурные зависимости намагниченности тонких пленок Ge:Mn

2019 ◽  
Vol 45 (2) ◽  
pp. 36
Author(s):  
А.И. Дмитриев ◽  
М.С. Дмитриева ◽  
Г.Г. Зиборов
Keyword(s):  
Magnetic Field ◽  
Magnetic Anisotropy ◽  
Lognormal Distribution ◽  
Anisotropy Constant ◽  
Zero Field ◽  
Magnetization Curves ◽  
Magnetic Anisotropy Energy ◽  
Size Dependent ◽  
Magnetic Anisotropy Constant ◽  
Temperature Dependences

AbstractThe temperature dependences of magnetization M ( T ) of thin ion-implanted Ge:Mn (4 at % Mn) films containing Ge_3Mn_5 clusters were measured on samples cooled in the absence of magnetic field (zero field cooled, ZFC) and in a magnetic field of 10 kOe (field-cooled, FC). It has been established that the shape of ZFC–FC differential M ( T ) curves is determined by lognormal distribution of the size-dependent magnetic anisotropy energy of Ge_3Mn_5 clusters. Analysis of the observed ZFC–FC magnetization curves allowed the magnetic anisotropy dispersion (variance) and magnetic anisotropy constant to be estimated.

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