Quantitative theory for hysteretic phenomena in CoNi magnetic thin films

Victora, R. H.

doi:10.1103/physrevlett.58.1788

Cited by 60 publications

(15 citation statements)

References 9 publications

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“…Judging from the different shapes and the very different coercivity values shown in Figs. 3(a) and (b), for the longitudinal and polar Kerr loops, respectively, we argue that the real reversal process is not just simple wall movement even at f ¼ 01 that is close to the easy axis direction [14,15]. This relates to the fact that the true easy axis is tilted out of the film due to the oblique magnetocrystalline structure [14,16] and the magnetization rotation will be involved.…”

Section: Discussionmentioning

confidence: 90%

Asymmetry of magneto-optical Kerr effect loops of Co nano-columns grown by oblique incident angle deposition

Tang

Liu

et al. 2004

Journal of Magnetism and Magnetic Materials

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Section: Discussionmentioning

confidence: 90%

Asymmetry of magneto-optical Kerr effect loops of Co nano-columns grown by oblique incident angle deposition

Tang

Liu

et al. 2004

Journal of Magnetism and Magnetic Materials

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“…Given the complexity of the energy surface in realistic cases, the final magnetization state can only be determined by consideration of the dynamic path of the magnetization during the reversal process. Dynamic calculations were first made by Victora [4] using the LLG equation (3) where is the unit vector and is the gyromagnetic ratio. is a phenomenological damping constant.…”

Section: Micromagnetics and The Landau-lifshitz-gilbert (Llg) Equmentioning

confidence: 99%

“…The theory is based on the work of Brown [7]. It is assumed that thermal effects can be represented by a random field having a Gaussian distribution with zero magnitude and a variance given by (4) where is the time step, is the saturation magnetization of the material, and is the particle volume. Numerically, it is easy to determine an instantaneous thermal field from (4).…”

Section: Micromagnetics and The Landau-lifshitz-gilbert (Llg) Equmentioning

confidence: 99%

Moving toward an atomistic reader model

et al. 2005

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ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. Abstract-With the move to recording densities up to and beyond 1 Tb/in 2 , the size of read elements is continually reducing as a requirement of the scaling process. The expectation is for read elements containing magnetic films as thin as 1.5 nm, in which finite size effects, and factors such as interface mixing might be expected to become of increasing importance. Here, we review the limitations of the current (micromagnetic) approach to the theoretical modeling of thin films and develop an atomistic multiscale model capable of investigating the magnetic properties at the atomic level. Finite-size effects are found to be significant, suggesting the need for models beyond the micromagnetic approach to support the development of future read sensors.Index Terms-Atomistic calculations, computational modeling, read elements.

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“…Their results confrrm that nucleation of reversed domains and subsequent wall motion determine the coercivity of perpendicular thin film recording media. Victora and coworkes (4] presented a three dimensional micromagnetic model of magnetic thin films consisting of columnar grains. The model allows a non uniform magnetisation in the direction of the ftlm nonnal and thus takes into account magnetisation curling within the individual grains.…”

Section: Introductionmentioning

confidence: 99%

Micromagnetic Simulation of Mo-Multilayers

Schrefl

Fidler

1996

J. Magn. Soc. Jpn.

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~ Micromagnetic finite element calculations rigorously describe the effects of microstructural features on the magnetic properties of ColPt multilayer thin films. Within the framework of static micromagnetism. the hysteresis properties result from subsequent minimum energy solutions for decreasing or increasing applied fields. The concurrent modelling of inhomogeneous magnetic states within the individual grains and of co-operative reversal processes leads to a large-scale optimisation problem. In order to reduce the number of variables. shell elements which account for the multilayer structure and a magnetic vector potential to treat the long-range stray fields are used. Micromagnetic calculations of demagnetisation curves and domain structures in ColPt multilayer systems show a qualitative agreement with experimental data obtained from Lorentz electron microscopy. The nucleation field of ColPt multilayer increases with improving texture. Spatial fluctuations of the anisotropy directions from grain to grain create barriers for domain wall . motion. The pinning field increases with increasing grain size. The coercive squareness improves with decreasing number ofbilayers. The ac-demagneJised state shows a maze-like structure. The underlying skeleton shape of the domain structure remains substantially unchanged under an applied field. The transition width and the domain wall jaggedness increase with decreasing quality of texture and increasing grain size.

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Quantitative theory for hysteretic phenomena in CoNi magnetic thin films

Cited by 60 publications

References 9 publications

Asymmetry of magneto-optical Kerr effect loops of Co nano-columns grown by oblique incident angle deposition

Asymmetry of magneto-optical Kerr effect loops of Co nano-columns grown by oblique incident angle deposition

Moving toward an atomistic reader model

Micromagnetic Simulation of Mo-Multilayers

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