Practical FeCo Films for Perpendicular Writer Pole

Inturi, V. R.; Yin, Handong; Kief, M. T.; Hadley, Matthew; Mathieu, C.

doi:10.1109/tmag.2011.2170155

Cited by 16 publications

(7 citation statements)

References 39 publications

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“…Signatures of anomalies in the magnetization reversal process, i.e., the non-monotonic behavior of M r and H c as a function of the applied field angle, have been previously observed near the magnetic hard axis by several groups in samples with anisotropy dispersion, 13,15,38,57 including samples with biaxial anisotropy. 36,44,52 However, in these previous works, the phenomenon was not explored in detail and the underlying physics of this anomaly could not be clearly identified.…”

Section: Anomalous Magnetization Reversal Near the Hamentioning

confidence: 70%

“…Another example is given by the attempt to correlate anisotropy dispersion with magnetization reversal for in-plane magnetized films. 1,13,15,28,33,45,57 Also in this case, a clear correlation in between sample structure and magnetization reversal behavior could not be established, even though some of these works managed to correlate different magnetic properties with each other. Thus, a comprehensive and systematic analysis of the influence of crystallographic ordering onto magnetization reversal, especially in the regime of a sizable, but not diverging reversal correlation length is still lacking despite many decades of research on magnetization reversal in thin magnetic films.…”

mentioning

confidence: 90%

“…21,46,61 On the other hand, many studies have been performed for the purpose of analyzing the magnetization reversal mechanism in individual ferromagnetic films, including magnetic alloy films. 20,22,26,28,36,42,44,45,49,51,52,55,57 Hereby, many works have been focused on alloys made from 4d/5d transition metals and 3d elemental ferromagnets 14,26,42,49 or alloys of 4f elements with 3d elemental ferromagnets. 17,22,55 These types of alloys, besides having other interesting features, can lead to large magnetocrystalline anisotropies 14 as well as to unconventional magnetic phase transitions as a function of temperature.…”

mentioning

confidence: 99%

“…So, even though many works have analyzed how different types of local property variations affect magnetization reversal, 1,13,15,27,28,[33][34][35][36][37][38]44,45,52,57,66 the complexity of the underlying physics makes it very difficult to develop a comprehensive understanding of all the aspects involved. One such example is the effect of anisotropy dispersion that has been investigated in numerous studies.…”

mentioning

confidence: 99%

“…One such example is the effect of anisotropy dispersion that has been investigated in numerous studies. 1,13,15,28,[33][34][35]45,57 For instance, the angular dispersion impact onto perpendicular media was studied in Refs. 34 and 35 by extracting anisotropy dispersion angles from remanent magnetization data and correlating these values with X-ray diffraction (XRD) measurements.…”

mentioning

confidence: 99%

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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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