Thickness dependence of coercivity in LPE garnet films

Moore, E. B.; Calhoun, B. A.; Lee, K.

doi:10.1063/1.324791

Cited by 17 publications

(5 citation statements)

References 6 publications

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“…The serious problem was to keep a low coercivity of the films. It was observed that the lattice mismatch, Sm content, melt composition, growth rate, and point defects had an influence on the coercivity [68][69][70][71][72][73][74].…”

Section: Origin Of Coercivitymentioning

confidence: 99%

Coercive Properties of Magnetic Garnet Films

Vértesy

2023

Crystals

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Magnetic garnet films represent a wide family of materials. By the proper choice of chemical composition and growth parameters, their magnetic behavior can be tuned in a very wide range. On one side, they are suitable for many different applications; on the other side, they are optimal model materials for studying the basic magnetization processes. Many assumptions of the existing theories can be checked or validated by magnetic garnet film investigation. Their production technology was developed many decades ago, but even nowadays, magnetic garnet films have been intensively studied, and newer and newer application possibilities have been found. In this review paper, those results are summarized, which are connected with their coercive properties. Coercivity, or coercive force, is a frequently used magnetic characteristic, but usually, it is considered rather a technical parameter. It is shown that there is no correlation between the so-called “technical coercive force” (which is the half-width of a major hysteresis loop) and the domain wall coercivity (this is frequently called a domain wall pinning field). This latter parameter is considered a real characteristic of domain wall movement. If magnetic garnet films are investigated, the correlation between moving domain wall and material defect structure can be studied. In this paper, the very complex feature of coercivity is shown. It is demonstrated that the domain structure, the properties of domain walls, the existence of mechanical stresses, the temperature, the size of the sample and many other parameters have an influence on the measured coercivity.

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Section: Origin Of Coercivitymentioning

confidence: 99%

Coercive Properties of Magnetic Garnet Films

Vértesy

2023

Crystals

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“…-= --= 6 Sl.n e ' dr dR (2) where R is the bubble radius, 6 is the wall thickness parameter, r is the amplitude of the radial vector stemming from the bubble center. The angle ~ is the azimuthal anqle used in conjunction with r to specify a position within the film plane.…”

Section: Fundamental Analysismentioning

confidence: 99%

“…(2) and (4l the change in wall energy associated with F(0), summed over all of the anisotropic ions is S1.n -, n, dF( 0J I ' 0 d0 1. (2) and (4l the change in wall energy associated with F(0), summed over all of the anisotropic ions is S1.n -, n, dF( 0J I ' 0 d0 1.…”

Section: Fundamental Analysismentioning

confidence: 99%

“…Coercive force in bubble domain films, both amorphous and single crystal, is attributed to compositional inhomogeneities [I] , film thickness variations or to surface and film-substrate interactions [2]. Coercive force is usually measured by either a hysteresis method performed on a macroscopic area of film [3] or by a bubble propagation technique [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Quenching of coercive force in bubble films by domain wall restoring forces

Walling

1979

Journal of Applied Physics

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A mechanism is proposed to account for the disparity between coercive force in bubble domain films as measured by hysteresis techniques, which employ an ac-bias field component to move the wall, from that measured in pulsed bubble propagation experiments. In the proposed mechanism the magnetic restoring forces, that resist coercivity produced distortions of the wall pattern, greatly reduce the time average lag of the wall position caused by coercivity, to the extent that the restoring forces dominate the actual or true coercive force. The coercive force, measured by the hysteresis method, is proportional to the time average hysteresis lag and is thus reduced or quenched by these restoring forces. In bubble propagation, on the other hand, the restoring forces that affect bubble propagation are absent. A formula which relates the coercive force measured by the two techniques is derived. The theory is tested with experimental data on 1.8-μm and 3-μm films of the composition {Y,Sm,Lu,Ca}3[Fe,Ge,Lu]2 (Fe,Ge)3O12.

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“…͑2͒. The thickness dependence of coercivity was investigated by a number of authors, [7][8][9] and the H c ϳh Ϫ1 dependence was found to be valid. We also experienced a slight increase of the coercivity in the case of the larger ⌬h values ͑0.8-1.4 m͒, but this change was not significant, compared with the original value of H cw , and the effect resulted in a uniform shift of the H cw (T) curve, without any influence on the step-wise exponential character of the curve or on the breaking points in the semilogarithmic plot.…”

Section: Samplementioning

confidence: 99%

Modifying the temperature dependence of magnetic garnet film coercivity by etching

Vértesy

Keszei

1999

Journal of Applied Physics

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The temperature dependence of the domain-wall coercive field of epitaxial magnetic garnet films was modified in a defined temperature range by removing the surface layer of the films. Outside the given temperature range the coercivity versus temperature curve did not change. The result supports a model of coercivity according to which different sets of material imperfections are responsible for pinning the domain walls in different temperature regions. Appropriate processing of the samples enables some of the pinning sets to be modified independently of each other.

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Thickness dependence of coercivity in LPE garnet films

Cited by 17 publications

References 6 publications

Coercive Properties of Magnetic Garnet Films

Coercive Properties of Magnetic Garnet Films

Quenching of coercive force in bubble films by domain wall restoring forces

Modifying the temperature dependence of magnetic garnet film coercivity by etching

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