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Nature of Defects Induced by Au Implantation in Hexagonal Silicon Carbide Single Crystals

J.P. Adam 1 S. Rohart 1 J.-P. Jamet 1 A. Mougin 1 J. Ferré 1 H. Bernas 2 G. Faini 3 J. Fassbender
2 CSNSM PS2
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière
Abstract : We investigate the dynamics of the magnetization reversal in single Pt/Co(0.5 nm)/Pt nano-discs with diameter 130 nm, fabricated by He+ ion irradiation. They exhibit a very narrow distribution of small switching fields and a perpendicular magnetic anisotropy. In spite of their small magnetic volume, thermally activated magnetization reversal cannot be interpreted within the usual Néel-Brown model. Non-coherent magnetization reversal proceeds here by fast nucleation at nano-disc borders and rather slow wall motion towards their center. Dynamics are perfectly accounted for by a 2D-confined droplet model, involving the wall energy rather than the anisotropy energy. On the other hand, the blocking temperature for these nano-discs is well described by the coherent spin reversal model.
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Submitted on : Wednesday, August 22, 2012 - 12:59:48 PM
Last modification on : Tuesday, June 22, 2021 - 3:43:18 AM

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J.P. Adam, S. Rohart, J.-P. Jamet, A. Mougin, J. Ferré, et al.. Nature of Defects Induced by Au Implantation in Hexagonal Silicon Carbide Single Crystals. Journal of the Magnetics Society of Japan, 2009, 33, pp.498. ⟨10.3379/msjmag.0907MI0009⟩. ⟨in2p3-00724695⟩

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