Conditions for stress-induced uniaxial anisotropy in magnetic materials of cubic symmetry

"The Co11Zr2 magnetic phase was obtained by a combination of melting, mechanical milling and high temperature annealing. The structure and magnetic properties of the obtained material were investigated. Even though the samples possessed low coercivity, it was shown that they possess uniaxial anisotropy. Keywords: hard magnetic materials, magnetic anisotropy, mechanical milling, high temperature annealing "

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Stability of Jiles-Atherton Anhysteretic Magnetization Curve Model for Magnetic Materials with Uniaxial Anisotropy

Advances in Intelligent Systems and Computing - Automation 2020: Towards Industry of the Future ◽

10.1007/978-3-030-40971-5_32 ◽

2020 ◽

pp. 353-358

Author(s):

Roman Szewczyk

Keyword(s):

Magnetic Materials ◽

Magnetization Curve ◽

Uniaxial Anisotropy ◽

Curve Model ◽

Anhysteretic Magnetization

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Features of the 180º pulsed magnetization reversal of ferrite-garnet films with biaxial anisotropy in their plane

Electromagnetic field and materials (fundamental physical research) »with international participation ◽

10.12737/23119 ◽

2016 ◽

Author(s):

Матюнин ◽

Andrey Matyunin ◽

Николадзе ◽

Georgiy Nikoladze ◽

Поляков ◽

...

Keyword(s):

Magnetic Materials ◽

Magnetization Reversal ◽

Visual Representation ◽

Experimental Studies ◽

Uniaxial Anisotropy ◽

Ferrite Garnet ◽

Garnet Films ◽

First Time ◽

Nonlinear Magnetization

The calculations and experimental studies have shown that the intensity of nonlinear magnetization oscillations arising during the process of 180 pulsed magnetization reversal of real ferrite-garnet films with biaxial anisotropy weakly depends on the magnetization reversal pulse Hp frontf duration (in contrast to magnetic materials with uniaxial anisotropy). The pulsed magnetization reversalcurve, which provides a visual representation of the magnetization reversal speed saturation caused by the influence of nonlinear magnetization oscillations, analyzed for the first time.

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Experimental Verification of Isotropic and Anisotropic Anhysteretic Magnetization Models

Materials ◽

10.3390/ma12091549 ◽

2019 ◽

Vol 12 (9) ◽

pp. 1549 ◽

Cited By ~ 2

Author(s):

Michał Nowicki ◽

Roman Szewczyk ◽

Paweł Nowak

Keyword(s):

Magnetic Materials ◽

Experimental Verification ◽

Magnetization Curve ◽

Magnetic Hysteresis ◽

Uniaxial Anisotropy ◽

Hysteresis Loops ◽

Anisotropic Energy ◽

Magnetic Hysteresis Loops ◽

Anhysteretic Magnetization ◽

Soft Ferrite

The anhysteretic magnetization curve is the key element of modeling magnetic hysteresis loops. Despite the fact that it is intensively exploited, known models of anhysteretic curve have not been verified experimentally. This paper presents the validation of four anhysteretic curve models considering four different materials, including isotropic, such as Mn-Zn soft ferrite, as well as anisotropic amorphous and nanocrystalline alloys. The presented results indicate that only the model that considers anisotropic energy is valid for a wide set of modern magnetic materials. The most suitable of the verified models is the anisotropic extension function-based model, which considers uniaxial anisotropy.

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On the origin of the uniaxial anisotropy in nanocrystalline soft-magnetic materials

Journal of Applied Physics ◽

10.1063/1.364164 ◽

1997 ◽

Vol 81 (2) ◽

pp. 806-814 ◽

Cited By ~ 43

Author(s):

E. van de Riet ◽

W. Klaassens ◽

F. Roozeboom

Keyword(s):

Magnetic Materials ◽

Uniaxial Anisotropy ◽

Soft Magnetic Materials ◽

Soft Magnetic

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Grain separation enhanced magnetic coercivity in Pt/Co multilayers.

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100151027 ◽

1993 ◽

Vol 51 ◽

pp. 1038-1039 ◽

Cited By ~ 1

Author(s):

G.A. Bertero ◽

R. Sinclair

Keyword(s):

Remanent Magnetization ◽

Strong Influence ◽

Uniaxial Anisotropy ◽

Magnetic Coupling ◽

Recording Media ◽

Magnetic Media ◽

Signal To Noise ◽

Out Of Plane ◽

Longitudinal Recording ◽

The Relationship

Pt/Co multilayers displaying perpendicular (out-of-plane) magnetic anisotropy and 100% perpendicular remanent magnetization are strong candidates as magnetic media for the next generation of magneto-optic recording devices. The magnetic coercivity, Hc, and uniaxial anisotropy energy, Ku, are two important materials parameters, among others, in the quest to achieving higher recording densities with acceptable signal to noise ratios (SNR). The relationship between Ku and Hc in these films is not a simple one since features such as grain boundaries, for example, can have a strong influence on Hc but affect Ku only in a secondary manner. In this regard grain boundary separation provides a way to minimize the grain-to-grain magnetic coupling which is known to result in larger coercivities and improved SNR as has been discussed extensively in the literature for conventional longitudinal recording media.We present here results from the deposition of two Pt/Co/Tb multilayers (A and B) which show significant differences in their coercive fields.

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The need of electron microscopy in the study of domains and domain walls in ferroelectrics

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100170487 ◽

1994 ◽

Vol 52 ◽

pp. 550-551

Author(s):

Wenwu Cao

Keyword(s):

Domain Wall ◽

Domain Walls ◽

High Mobility ◽

Continuum Theory ◽

Polarization Vector ◽

Ferroelectric Materials ◽

Dielectric Constants ◽

Nonlocal Coupling ◽

Cubic Symmetry ◽

Gradient Energy

Domain structures play a key role in determining the physical properties of ferroelectric materials. The formation of these ferroelectric domains and domain walls are determined by the intrinsic nonlinearity and the nonlocal coupling of the polarization. Analogous to soliton excitations, domain walls can have high mobility when the domain wall energy is high. The domain wall can be describes by a continuum theory owning to the long range nature of the dipole-dipole interactions in ferroelectrics. The simplest form for the Landau energy is the so called ϕ model which can be used to describe a second order phase transition from a cubic prototype,where Pi (i =1, 2, 3) are the components of polarization vector, α's are the linear and nonlinear dielectric constants. In order to take into account the nonlocal coupling, a gradient energy should be included, for cubic symmetry the gradient energy is given by,

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