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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

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Received: 21 August 2013; in revised form: 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 which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

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.

AMA Style

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(11):5247-5257.

Chicago/Turabian Style

Su, Chiung-Wu; Chang, Yen-Chu; Chang, Sheng-Chi. 2013. "Magnetic Phase Transition in Ion-Irradiated Ultrathin CoN Films via Magneto-Optic Faraday Effect." Materials 6, no. 11: 5247-5257.


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