Europhys. Lett., 64 (5) , pp. 668-674 (2003)
Xenon-ion-induced phase transition in thin filmsK. Zhang1, R. Gupta1, 2, K. P. Lieb1, Y. Luo3, G. A. Müller1, P. Schaaf1 and M. Uhrmacher1
1 II. Physikalisches Institut and SFB 602, Universität Göttingen Tammannstr. 1, D-37077 Göttingen, Germany
2 Institute of Instrumentation, D. A. University - Khandwa Road, Indore-452017, India
3 I. Physikalisches Institut, Universität Göttingen Tammannstr. 1, D-37077 Göttingen, Germany
(Received 26 May 2003; accepted in final form 30 September 2003)
We report on the observation of the ion-induced hcp fcc phase transition in 75 thick polycrystalline films, which were irradiated with 200 ions to fluences of - at a temperature of 300 . Analyses by means of Rutherford Backscattering Spectroscopy (RBS), X-Ray Diffraction (XRD), Magneto-Optical Kerr Effect (MOKE) and Vibrating Sample Magnetometry (VSM) provided information on the film thickness and the implanted profiles, the phase structure, the ion-induced lattice expansion and the magnetic hysteresis, respectively. After film deposition and irradiations up to , we predominantly found the hcp phase (XRD, uniaxial MOKE pattern) with an in-plane magnetization. The transition to fourfold in-plane magnetization typical of the fcc-phase occurred around a fluence of . We interpreted these findings as due to rapid cooling of thermal spikes into the metastable -fcc phase.
61.80.Jh - Ion radiation effects.
75.30.Gw - Magnetic anisotropy.
75.50.Cc - Other ferromagnetic metals and alloys.
© EDP Sciences 2003