An approach for researching uniaxial anisotropy magnet: Rotational magnetization

Fan, Xiaolong; Xue, Desheng; Jiang, Changjun; Gong, Yu; Li, Jinyun

doi:10.1063/1.2821729

Cited by 18 publications

(9 citation statements)

References 25 publications

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“…The IPUMA field H k was determined by the magnetization rotation method, which measures the magnetization as a function of the angle between the magnetic field and the reference axis. The information about the anisotropy, such as the directions of the easy axis (EA) and hard axis (HA), as well as H k , was then acquired [27,28]. The microwave permeability measurements of the film were taken with a PNA E8363B vector network analyzer using the microstrip method from 100 MHz to 9 GHz.…”

Section: Methodsmentioning

confidence: 99%

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Soft magnetic properties and high frequency characteristics of FeM (M = B, Hf, Zr) and pure Fe films fabricated by oblique deposition

et al. 2015

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To improve the high-frequency properties of Fe-based thin films, doped and pure Fe thin films were obliquely deposited on Si (100) substrate by RF-magnetron sputtering. Vibrating sample magnetometer (VSM) measurements show obvious in-plane uniaxial magnetic anisotropy in both doped and pure Fe thin films, and enhancement effects of doping on Soft magnetic properties were also observed. Microwave permeability measurements indicate that the resonance frequency and permeability of pure Fe films are much larger than those of doped Fe thin films. Damping factors of Fe thin films deposited at different oblique angles were further investigated.

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Section: Methodsmentioning

confidence: 99%

“…Among these, element doping and oblique deposition techniques are quite simple and effective methods for improving the microwave characteristics of soft-magnetic thin films [27]. Therefore, doping with different elements and oblique deposition technique were employed in this paper.…”

Section: Introductionmentioning

confidence: 99%

Soft magnetic properties and high frequency characteristics of FeM (M = B, Hf, Zr) and pure Fe films fabricated by oblique deposition

et al. 2015

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“…It is assumed that the longitudinal component H z stays extremely larger than the perpendicular component H x which is free to be tuned and is defined as a bias field for later discussion. Currently, the study of the switching behavior of a uniaxial magnet in the presence of a bias field, in addition to a longitudinal field, has been attracting increasing attention [27,28]. For the purpose of seeking the critical value of H x at which the switching occurs supposing that H z is fixed, the functional dependence H z (H x ) describing interplay of these two critical fields is plotted in the following figure and given mathematically as [11,[29][30][31]:…”

Section: Stoner-wohlfarth Modelmentioning

confidence: 99%

Magnetic Switching of a Stoner-Wohlfarth Particle Subjected to a Perpendicular Bias Field

Xue

2019

Electronics

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Characterized by uniaxial magnetic anisotropy, the Stoner-Wohlfarth particle experiences a change in magnetization leading to a switch in behavior when tuned by an externally applied field, which relates to the perpendicular bias component (hperp) that remains substantially small in comparison with the constant switching field (h0). The dynamics of the magnetic moment that governs the magnetic switching is studied numerically by solving the Landau-Lifshitz-Gilbert (LLG) equation using the Mathematica code without any physical approximations; the results are compared with the switching time obtained from the analytic method that intricately treats the non-trivial bias field as a perturbation. A good agreement regarding the magnetic switching time (ts) between the numerical calculation and the analytic results is found over a wide initial angle range (0.01 < θ0 < 0.3), as h0 and hperp are 1.5 × K and 0.02 × K, where K represents the anisotropy constant. However, the quality of the analytic approximation starts to deteriorate slightly in contrast to the numerical approach when computing ts in terms of the field that satisfies hperp > 0.15 × K and h0 = 1.5 × K. Additionally, existence of a comparably small perpendicular bias field (hperp << h0) causes ts to decrease in a roughly exponential manner when hperp increases.

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“…It has been reported recently that magnetization process of the magnetic moment in rotational field could be applied to deduce the anisotropy field of thin films with uniaxial anisotropy by fitting rotational magnetization curves (RMC) [7,8] . Without knowing the directions of the easy-and hard-axis of the materials, the information on the anisotropy field, the anisotropy constants K 1 and K 2 , as well as the directions of easy-and hard-axis of the film, can be deduced by fitting the experimental RMCs according to theoretical models.…”

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confidence: 99%

Determination of the in-plane anisotropy field in hexagonal systems via rotational magnetization: Theoretical model and Monte Carlo simulations

Wang

Pang

2009

Sci. China Ser. G-Phys. Mech. Astron.

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The magnetic anisotropy field in thin films with in-plane uniaxial anisotropy can be deduced from the VSM magnetization curves measured in magnetic fields of constant magnitudes. This offers a new possibility of applying rotational magnetization curves to determine the first-and second-order anisotropy constant in these films. In this paper we report a theoretical derivation of rotational magnetization curve in hexagonal crystal system with easy-plane anisotropy based on the principle of the minimum total energy. This model is applied to calculate and analyze the rotational magnetization process for magnetic spherical particles with hexagonal easy-plane anisotropy when rotating the external magnetic field in the basal plane. The theoretical calculations are consistent with Monte Carlo simulation results. It is found that to well reproduce experimental curves, the effect of coercive force on the magnetization reversal process should be fully considered when the intensity of the external field is much weaker than that of the anisotropy field. Our research proves that the rotational magnetization curve from VSM measurement provides an effective access to analyze the in-plane anisotropy constant K 3 in hexagonal compounds, and the suitable experimental condition to measure K 3 is met when the ratio of the magnitude of the external field to that of the anisotropy field is around 0.2. rotational magnetization curve, magnetocrystalline anisotropy, in-plane anisotropy constant K 3Magnetocrystalline anisotropy is one of the intrinsic properties of magnets, which determines the applications of magnetic materials. As a result, to precisely measure the magnetic anisotropy field and the anisotropy constants of magnetic materials has long been an important aspect in magnetic research. With the development of information and communication technologies, data transfer at gigahertz (GHz) is required, which stimulates the investigation to improve the high frequency magnetic properties of materials. For cubic materials, there is a theoretical limit to the ferromagnetic resonance frequency known as Snoek's law [1]

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An approach for researching uniaxial anisotropy magnet: Rotational magnetization

Cited by 18 publications

References 25 publications

Soft magnetic properties and high frequency characteristics of FeM (M = B, Hf, Zr) and pure Fe films fabricated by oblique deposition

Soft magnetic properties and high frequency characteristics of FeM (M = B, Hf, Zr) and pure Fe films fabricated by oblique deposition

Magnetic Switching of a Stoner-Wohlfarth Particle Subjected to a Perpendicular Bias Field

Determination of the in-plane anisotropy field in hexagonal systems via rotational magnetization: Theoretical model and Monte Carlo simulations

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