Thermal stability of magnetic properties of nanocrystalline (Fe0.7Co0.3)88Hf4Mo2Zr1B4Cu1 alloy with induced magnetic anisotropy

Thermal stability of induced magnetic anisotropy (IMA) was studied in a course of subsequent annealings without any external effects for already field- or stress-annealed specimens of the nanocrystalline Fe73.5Cu1Nb3Si13.5B9 and amorphous Fe3Co67Cr3Si15B12 alloys. For these alloys the dependence of IMA thermal stability on the magnitude of the IMA constant (Ku) and temperature of stress-annealing was investigated. For the nanocrystalline alloy thermal stability of field- and stress-induced anisotropy with identical Ku was compared. It was shown that nanocrystalline specimens with identical Ku values after field- or stress-annealing have identical thermal stability of IMA. This can point to a similarity of the mechanisms of IMA formation after field- or stress-annealings. Thermal stability of stress-induced anisotropy in the nanocrystalline alloy with Ku value less than 1000 J/m3 and the amorphous alloy with Ku less than 100 J/m3 depends on the value of Ku. For both stress-annealed nanocrystalline and amorphous alloys magnetic anisotropy induced at higher temperatures is more stable because more long-range and energy-taking processes take place at these temperatures.

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Effects of the Co-Presence of Conflicting Magnetic Anisotropy in Ba Ferrite Particles

Advances in Science and Technology ◽

10.4028/www.scientific.net/ast.67.108 ◽

2010 ◽

Vol 67 ◽

pp. 108-112

Author(s):

Giancarlo Bottoni

Keyword(s):

Thermal Stability ◽

Magnetic Properties ◽

Magnetic Anisotropy ◽

Low Temperatures ◽

Magnetocrystalline Anisotropy ◽

Shape Anisotropy ◽

Recording Media ◽

Magnetization Switching ◽

Crystalline Anisotropy ◽

Thermal Stability Of

In Ba ferrite particles magnetocrystalline and shape anisotropies are contemporarily present and conflicting. The strength and evolution of the two anisotropies are studied, through the dependence of the anisotropy constants on temperature. While in pure Ba ferrite particles the anisotropy is uniaxial at all temperatures, since the magnetocrystalline anisotropy clearly prevails on shape anisotropy, in particles modified for employment in recording media the two anisotropies are comparable and at low temperatures the shape anisotropy result stronger than the crystalline anisotropy. Besides the irregular shape of the particles introduces further preferred directions for the magnetization. The Co/Ti-doped particles show a multiple axes anisotropy. The macroscopic magnetic properties are found in relationship with the evolution of the anisotropy. Also the influence that the presence of such multiple anisotropy has on the magnetization switching and on the thermal stability of the magnetization of the Ba ferrite particles is analyzed.

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Thermal stability of the induced magnetic anisotropy and structure of the nanocrystalline alloy FeCuNbSiB

Journal of Magnetism and Magnetic Materials ◽

10.1016/s0304-8853(00)00298-5 ◽

2000 ◽

Vol 215-216 ◽

pp. 453-454 ◽

Cited By ~ 1

Author(s):

N.V Dmitrieva ◽

N.M Kleinerman ◽

V.A Lukshina ◽

V.V Serikov ◽

A.P Potapov

Keyword(s):

Thermal Stability ◽

Magnetic Anisotropy ◽

Nanocrystalline Alloy ◽

Induced Magnetic Anisotropy ◽

Thermal Stability Of

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Magnetic properties, thermal stability, and structure of the nanocrystalline soft magnetic (Fe0.7Co0.3)88Hf2W2Mo2Zr1B4Cu1 alloy with induced magnetic anisotropy

The Physics of Metals and Metallography ◽

10.1134/s0031918x14040061 ◽

2014 ◽

Vol 115 (4) ◽

pp. 326-334 ◽

Cited By ~ 4

Author(s):

N. V. Dmitrieva ◽

V. A. Lukshina ◽

E. G. Volkova ◽

A. P. Potapov ◽

B. N. Fillipov ◽

...

Keyword(s):

Thermal Stability ◽

Magnetic Properties ◽

Magnetic Anisotropy ◽

Soft Magnetic ◽

Induced Magnetic Anisotropy

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Nanocrystalline Soft Magnetic Fe-, Co-Based Alloys Doped by Hf, Mo and Zr with Enhanced Thermal Stability of Magnetic Properties

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.215.196 ◽

2014 ◽

Vol 215 ◽

pp. 196-199

Author(s):

Anatolii P. Potapov ◽

Natalia V. Dmitrieva ◽

Vera A. Lukshina ◽

Elena G. Volkova ◽

Boris N. Filippov

Keyword(s):

Thermal Stability ◽

Magnetic Properties ◽

Magnetic Anisotropy ◽

Easy Axis ◽

Subsequent Annealing ◽

Soft Magnetic ◽

Different Temperatures ◽

Thermal Stability Of

Magnetic properties, thermal stability and structure of the alloys - (Fe0.6Co0.4)86Hf7B6Cu1 (1), (Fe0.7Co0.3)88Hf7B4Cu1 (2) and (Fe0.7Co0.3)88Hf4Mo2Zr1B4Cu1 (3) obtained in the form of ribbons quenched from the melt were investigated after their nanocrystallization in the course of the thermal (TA) and stress (SA) annealings in the air at different temperatures. In all three alloys SA resulted in the induction of magnetic anisotropy with an easy axis along the direction of the ribbon. It is established that the alloy 3 after SA at 620°C for 20 min has the best thermal stability of magnetic properties, which remained practically unchanged after the subsequent annealing at 550°C for 26 hours. Magnetic properties of the alloys 1 and 2 subjected to SA under the same conditions did not change after annealing at 500°C.

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