Relationship between coercive force and anisotropy field for oriented barium ferrite tapes and magnets

Fayling, R.

doi:10.1063/1.324825

Cited by 10 publications

(4 citation statements)

References 4 publications

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“…Many methods have been explored to measure magnetic anisotropy. Some methods can only give the first-order term or the effective anisotropy field to estimate the anisotropy, such as the intersection method 15 , the area method 16 , and the singular point detection (SPD) method 17 18 but these methods are not sufficiently accurate for our experiments. There are also a few methods that can give higher-order terms, such as the torque method 19 20 21 and the magnetic resonance method 22 23 .…”

Section: Methodsmentioning

confidence: 99%

Magnetic field-dependent shape anisotropy in small patterned films studied using rotating magnetoresistance

Fan

Zhou

Rao

et al. 2015

Sci Rep

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Based on the electric rotating magnetoresistance method, the shape anisotropy of a Co microstrip has been systematically investigated. We find that the shape anisotropy is dependent not only on the shape itself, but also on the magnetization distribution controlled by an applied magnetic field. Together with micro-magnetic simulations, we present a visualized picture of how non-uniform magnetization affects the values and polarities of the anisotropy constants and . From the perspective of potential appliantions, our results are useful in designing and understanding the performance of micro- and nano-scale patterned ferromagnetic units and the related device properties.

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Section: Methodsmentioning

confidence: 99%

Magnetic field-dependent shape anisotropy in small patterned films studied using rotating magnetoresistance

Fan

Zhou

Rao

et al. 2015

Sci Rep

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“…The magnetic anisotropy constant K A and anisotropy field H A of ferromagnetic materials are generally obtained from the analysis of magnetization curves, saturated torque curves or ferromagnetic resonance [1][2][3][4][5][6][7][8][9][10]. It is particularly important to determine K A and H A of polycrystalline permanent magnets with high intrinsic coercive force H CJ .…”

Section: Introductionmentioning

confidence: 99%

A comparison of magnetic anisotropy constants and anisotropy fields of permanent magnets determined by various measuring methods

Nishio

Taguchi

Hashimoto

et al. 1996

J. Phys. D: Appl. Phys.

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Uni-axial anisotropy constants and uni-axial anisotropy fields of oriented polycrystalline magnets were obtained from the field-dependence of the magnetization by three methods and from torque measurements. The results from torque measurements are found to be superior to those from the intersections of magnetization curves for fields parallel and perpendicular to the preferred axis, the integral of the perpendicular magnetization and the maximum in the second derivative of the perpendicular magnetization, called the singular point detection (SPD) method. Sintered Sr ferrite magnets can be considered as quasi-single crystals because of their high degree of orientation and their large crystal grain sizes in the range . A value of was obtained by extrapolation to high field of the term determined by Fourier analysis of unsaturated torque curves. This is closer to the result for single crystals than the other methods. The SPD method was used to analyse data recorded in high pulsed fields to determine the large values of for sintered Nd - Dy - Fe - B magnets with various compositions. There is an increase in that is linear in the Dy content.

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“…17 of the supplementary material below, similar to that observed in the ME multiferroic 0.9BiFeO 3 -0.1BaTiO 3 system 34 . Thus, such anomalous temperature dependent variations of magnetic coercivity in our Bi-Fe codoped compounds is likely governed by the com-petition between magnetocrystalline anisotropy and ME coupling [31][32][33] . The ratio of H C at 300 K to H C at 10 K (the factor of reduction of coercive field), can, thus, be used as an indicative marker for the strength of ME coupling [which is plotted in Fig.5(d)], which, for this series, becomes the strongest for x=0.05 composition, possibly driven by the right appropriate mix of simultaneously large ferroelectric polarization and ferromagnetic moment value, likely within the same tetragonal phase.…”

Section: Tuning Of Room-temperature Ferromagnetic Propertiesmentioning

confidence: 93%

Engineering room-temperature multiferroicity in Bi and Fe codoped BaTiO3

Pal

Paramanik

Rudrapal

et al. 2020

Applied Physics Letters

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Fe doping into BaTiO3 stabilizes the paraelectric hexagonal phase in place of the ferroelectric tetragonal one. We show that simultaneous doping of Bi along with Fe into BaTiO3 effectively enhances the magnetoelectric (ME) multiferroic response (both ferromagnetism and ferroelectricity) at room temperature, through careful tuning of Fe valency along with the controlled recovery of the ferroelectric-tetragonal phase. We also report a systematic increase in large dielectric constant values as well as reduction in loss tangent values with relatively moderate temperature variation of the dielectric constant around room temperature with increasing Bi doping content in Ba1−xBixTi0.90Fe0.10O3 (0 ≤ x ≤ 0.10), which makes the higher Bi–Fe codoped sample (x = 0.08) promising for use as a room-temperature high-κ dielectric material. Interestingly, the x = 0.08 (Bi–Fe codoped) sample is not only found to be ferroelectrically (∼20 times) and ferromagnetically (∼6 times) stronger than x = 0 (only Fe-doped) at room temperature, but also observed to be better insulating (larger bandgap) with indirect signatures of larger ME coupling as indicated from anomalous reduction of the magnetic coercive field with decreasing temperature. Thus, room-temperature ME multiferroicity has been engineered in Bi and Fe codoped BTO (BaTiO3) compounds.

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Relationship between coercive force and anisotropy field for oriented barium ferrite tapes and magnets

Cited by 10 publications

References 4 publications

Magnetic field-dependent shape anisotropy in small patterned films studied using rotating magnetoresistance

Magnetic field-dependent shape anisotropy in small patterned films studied using rotating magnetoresistance

A comparison of magnetic anisotropy constants and anisotropy fields of permanent magnets determined by various measuring methods

Engineering room-temperature multiferroicity in Bi and Fe codoped BaTiO3

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