Random Magnetic Anisotropy and Ferromagnetic Resonance in Nanosrystalline Alloy Fe73.5CuNb3Si13.5B9

2010 ◽  
Vol 168-169 ◽  
pp. 365-368 ◽  
Author(s):  
S.V. Komogortsev ◽  
Rauf S. Iskhakov ◽  
P. Kuznetsov ◽  
A. Belyaeva ◽  
G. Bondarenko ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Ferromagnetic Resonance ◽  
Annealing Temperature ◽  
Anisotropy Field ◽  
Correlation Radius ◽  
Magnetization Curves ◽  
Annealing Conditions ◽  
Random Anisotropy ◽  
Random Magnetic Anisotropy ◽  
Annealing Temperature Dependence

In the paper, we will present experimental results on the Fe73.5CuNb3Si13.5B9 ferromagnetic resonance (FMR) line width as a function of annealing conditions, as well as the annealing-temperature dependence of the crystallite size, coercive force, and the magnetic anisotropy field. We shall show the interrelationship of these quantities, demonstrate that these parameters are all traceable to the nanoparticle crystallization, and indicate how they can be examined by extending the random anisotropy theory. To obtain quantitative parameters of random magnetic anisotropy we investigate the magnetization curves approaching saturation. This technique allows one to quantitatively determine the local magnetic anisotropy field (Ha) and magnetic anisotropy correlation radius (Rc), as well as to estimate the averaged magnetic anisotropy field (<Ha>L) and ferromagnetic correlation radius (RL).

scholarly journals Measurement of effective magnetic anisotropy field and ferromagnetic resonance bandwidth at ferromagnetic resonance frequency in magnetically uniaxial hexagonal ferrites

2019 ◽  
Vol 5 (1) ◽  
pp. 33-39
Author(s):  
Alexey S. Semenov ◽  
Aleksey G. Nalogin ◽  
Sergey V. Shcherbakov ◽  
Alexander V. Myasnikov ◽  
Igor M. Isaev ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Ferromagnetic Resonance ◽  
Transmission Lines ◽  
Anisotropy Field ◽  
Nominal Composition ◽  
Hexagonal Ferrites ◽  
Magnetic Texture ◽  
Measurement Results ◽  
Effective Magnetic Anisotropy ◽  
Ferromagnetic Resonance Frequency

In this work we have considered metrological problems and measurement of magnetic parameters and presented methods of measuring effective magnetic anisotropy field HAeff and ferromagnetic resonance bandwidth ∆H in magnetically uniaxial hexagonal ferrites in the electromagnetic microwave working frequency range. The methods allow measuring HAeff in the 10–23 and 28–40 kE ranges and ∆H in the 0.5–5.0 range. One method (suitable for wavelength measurements in free space in the 3-mm wavelength range) has been implemented for the 78.33–118.1 GHz range. The other method (based on the use of microstrip transmission lines) has been implemented for the 25–67 GHz range. The methods have been tested for polycrystalline specimens of hexagonal barium and strontium ferrites with nominal composition or complex substituted and having high magnetic texture. The measurement results have been compared with those obtained using conventional measurement methods and spherical specimens. Our methods prove to be highly accurate and reliable.

scholarly journals Температурная зависимость эффективного поля магнитной анизотропии и ширины линии ферромагнитного резонанса поликристаллических сложнозамещенных гексагональных магнитноодноосных ферритов в диапазоне частот 25-67 GHz

2020 ◽  
Vol 90 (5) ◽  
pp. 782
Author(s):  
С.В. Щербаков ◽  
А.Г. Налогин ◽  
В.Г. Костишин ◽  
А.С. Семенов ◽  
Н.Е. Адиатулина ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Ferromagnetic Resonance ◽  
Barium Hexaferrite ◽  
Anisotropy Field ◽  
Ceramic Technology ◽  
Strontium Hexaferrite ◽  
Temperature Changes ◽  
Temperature Range ◽  
Resonance Linewidth ◽  
Ferromagnetic Resonance Linewidth

In the work in the frequency range 25 – 67 GHz the temperature changes of the effective magnetic anisotropy field and ferromagnetic resonance linewidth of the samples isotropic and anisotropic hexaferrite SrFe11.2Al0.1Si0.15Ca0.15O19 and anisotropic hexaferrite BaFe10.4Al1.4Si0.15Mn0.1O19 were studied. The samples obtained by ceramic technology with the pressing of the raw blanks in a magnetic field of 10 kOe. The studies were carried out in the temperature range+25 – +85 ºC. It was found that in the specified temperature range, the change in magnetic anisotropy is 9.8 Oe/ºC for barium hexaferrite and 4.2 Oe/ºC for strontium hexaferrite, and the change in ferromagnetic resonance linewidth is 12.2 Oe/ºC for barium hexaferrite and 10 – 12.3 Oe/ºC for strontium hexaferrite.

Experimental and Numerical Investigations of the Magnetization Curves in the Nanocomposites Consisted of Several Ferromagnetic Phases

2010 ◽  
Vol 168-169 ◽  
pp. 369-372 ◽  
Author(s):  
S.V. Komogortsev ◽  
S. Smirnov ◽  
Rauf S. Iskhakov ◽  
N. Momot ◽  
A. Balaev ◽  
...  
Keyword(s):  
Correlation Function ◽  
Correlation Radius ◽  
Anisotropy Constant ◽  
Magnetization Curves ◽  
Two Phase ◽  
Numerical Investigations ◽  
Magnetic Anisotropy Constant ◽  
Random Anisotropy ◽  
Ferromagnetic Exchange ◽  
Phase Inhomogeneity

The magnetization correlation function for two-phase one-dimentional chain of the ferromagnetic exchange-coupled nanoparticles with a random anisotropy was calculated. The dependence of the magnetic correlation radius and the average magnetic anisotropy constant on the intrinsic size of the phase inhomogeneity was founded. The data allows estimating the applicability limits of the analytical equations for the magnetization curves approaching saturation of two-phase ferromagnetic nanomaterials.

Strong Perpendicular Magnetic Anisotropy with High Thermal Stability in Annealed Co/Native Oxide/Pd Multilayers

2013 ◽  
Vol 634-638 ◽  
pp. 2506-2511
Author(s):  
Qin Li Lv ◽  
Jian Wang Cai ◽  
Tao Li
Keyword(s):  
Thermal Stability ◽  
Magnetic Anisotropy ◽  
Annealing Temperature ◽  
Perpendicular Magnetic Anisotropy ◽  
Anisotropy Field ◽  
High Thermal Stability ◽  
Native Oxide ◽  
Perpendicular Anisotropy ◽  
Sharp Transition ◽  
Out Of Plane

A novel perpendicular magnetic material was obtained in the annealed Co/native oxide/Pd multilayer films. Upon thermal annealing in a vacuum, a sharp transition of magnetic anisotropy from in-plane to out-of-plane is observed for the Co/native oxide/Pd multilayers with 20 Å Co layers. These annealed Co/native oxide/Pd multilayers possess extremely large effect perpendicular anisotropy field (Heff) and perpendicular anisotropy energy (Ku), with the maximum Heff of 17 kOe and Ku of 5.1×106 erg/cm3 obtained in the annealed Co(20 Å)/native oxide/Pd(10 Å) multilayers. Moreover, the large perpendicular magnetic anisotropy sustains with annealing temperature varying from 200°C to 400°C, indicative of high thermal stability. The present results open the way to a third alternative for the realization of thermally stable perpendicular magnetic electrodes of tunnel junctions.

scholarly journals Ferromagnetic resonance and random magnetic anisotropy in nanocrystalline Fe-Zr-N films

2018 ◽  
Vol 185 ◽  
pp. 04004
Author(s):  
Elena Sheftel ◽  
Eugene Harin ◽  
Valentin Tedzhetov ◽  
Yuri Koksharov
Keyword(s):  
Magnetron Sputtering ◽  
Magnetic Anisotropy ◽  
Ferromagnetic Resonance ◽  
Random Magnetic Anisotropy ◽  
Effective Magnetic Anisotropy

The effective magnetic anisotropy of the ferromagnetic nanocrystalline Fe-Zr-N films prepared by magnetron sputtering under different conditions has been determined by both correlation magnetometry and ferromagnetic resonance methods. The effective magnetic anisotropy values obtained by the two methods are compared and the origin of the values is discussed.

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