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Materials 2013, 6(11), 5247-5257; doi:10.3390/ma6115247
Communication

Magnetic Phase Transition in Ion-Irradiated Ultrathin CoN Films via Magneto-Optic Faraday Effect

* ,
 and
Department of Electrophysics, National Chiayi University, 300 Syuefu Rd., Chiayi 60004, Taiwan
* Author to whom correspondence should be addressed.
Received: 21 August 2013 / Revised: 16 October 2013 / Accepted: 11 November 2013 / Published: 15 November 2013
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Abstract

The magnetic properties of 1 nm thick in-plane anisotropic Co ultrathin film on ZnO(0001) were investigated through successive 500 eV nitrogen-ion sputtering. Magneto-optical Faraday effects were used to observe the evolution of the ion-irradiated sample in longitudinal and perpendicular magnetic fields. The ferromagnetic phase of the initial in-plane anisotropic fcc β-Co phase transformation to β-Co(N) phase was terminated at paramagnetic CoNx phase. In-plane anisotropy with weak out-of-plane anisotropy of the Co/ZnO sample was initially observed in the as-grown condition. In the sputtering process, the N+ ions induced simultaneous sputtering and doping. An abrupt spin reorientation behavior from in-plane to out-of-plane was found under prolonged sputtering condition. The existence of perpendicular anisotropy measured from the out-of-plane Faraday effect may be attributed to the co-existence of residual β-Co and Co4N exchange bonding force by the gradual depletion of Co-N thickness.
Keywords: magneto-optic Faraday effects; Auger electron spectroscopy; cobalt nitrides; magnetic anisotropy; zinc oxide; magnetic phase transformation magneto-optic Faraday effects; Auger electron spectroscopy; cobalt nitrides; magnetic anisotropy; zinc oxide; magnetic phase transformation
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Su, C.-W.; Chang, Y.-C.; Chang, S.-C. Magnetic Phase Transition in Ion-Irradiated Ultrathin CoN Films via Magneto-Optic Faraday Effect. Materials 2013, 6, 5247-5257.

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