Microstructural origin of orientation ratio in magnetic recording media

Toney, Michael F.; Marinero, Ernesto E.; Hedstrom, J.

doi:10.1063/1.2169880

Cited by 3 publications

(2 citation statements)

References 22 publications

(19 reference statements)

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“…One approach to quantify partial or imperfect uniaxial magnetic anisotropy is the measurement of the orientation ratio of a sample. 73,74 Conventionally, the orientation ratio OR is defined as…”

Section: Basic Magnetic Characterizationmentioning

confidence: 99%

Magnetization reversal of in-plane uniaxial Co films and its dependence on epitaxial alignment

Idigoras

Suszka

Vavassori

et al. 2014

Journal of Applied Physics

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This work studies the influence of crystallographic alignment onto magnetization reversal in partially epitaxial Co films. A reproducible growth sequence was devised that allows for the continuous tuning of grain orientation disorder in Co films with uniaxial in-plane anisotropy by the controlled partial suppression of epitaxy. While all stable or meta-stable magnetization states occurring during a magnetic field cycle exhibit a uniform magnetization for fully epitaxial samples, non-uniform states appear for samples with sufficiently high grain orientation disorder. Simultaneously with the occurrence of stable domain states during the magnetization reversal, we observe a qualitative change of the applied field angle dependence of the coercive field. Upon increasing the grain orientation disorder, we observe a disappearance of transient domain wall propagation as the dominating reversal process, which is characterized by an increase of the coercive field for applied field angles away from the easy axis for well-ordered epitaxial samples. Upon reaching a certain disorder threshold level, we also find an anomalous magnetization reversal, which is characterized by a non-monotonic behavior of the remanent magnetization and coercive field as a function of the applied field angle in the vicinity of the nominal hard axis. This anomaly is a collective reversal mode that is caused by disorder-induced frustration and it can be qualitatively and even quantitatively explained by means of a two Stoner-Wohlfarth particle model. Its predictions are furthermore corroborated by Kerr microscopy and by Brillouin light scattering measurements.

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Section: Basic Magnetic Characterizationmentioning

confidence: 99%

Magnetization reversal of in-plane uniaxial Co films and its dependence on epitaxial alignment

Idigoras

Suszka

Vavassori

et al. 2014

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

“…The latter is the ratio of H c in the circumferential to that in the radial direction, and was brought about by a mechanical texturing process. Experimental studies on oriented media are yet to clarify as to what causes the OR [7][8][9][10]. It may be worthwhile to carry out film growth simulations of Cr underlayer and a Co-alloy recording layer (RL) on textured and non-textured substrates, to understand the real cause of preferred orientation along the track direction.…”

Section: Overview Of Longitudinal Magnetic Recordingmentioning

confidence: 98%