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Ferromagnetism of In1-XMnXSe and behaviour of excess Mn in InSe crystal
|George V. Lashkarev 1, Valentyna V. Slynko 1, Zakhar D. Kovalyuk 1, Vitalii I. Sichkovskyi 1, Mykhailo V. Radchenko 1, Pavlo Aleshkevych 2, Ritta Szymczak 2, Peter Lytvyn 3, Witold Dobrowolski 2, Roman Minikayev 2, Andrii V. Zaslonkin 1|
1. Institute for Problems of Materials Science, 3, Krzhizhanovsky, Kyiv 03142, Ukraine
Static magnetic susceptibility (MS), electron spin resonance (ESR) and magnetic force microscopy of annealed crystals InSe doped 5%at. Mn in the temperature range 2.4-300 K were studied.The XRD investigation of samples phase composition has shown, that the hexagonal phase InSe (Р63/mmc) with reduced lattice constant а=4.0026Å;с=16.634Å is basic one. The lowering of lattice periods testifies to creation of solid solution In1-XMnXSe which fills more than 90 % at crystal volume. Besides it samples contain second (cubic) phase MnSe (Fm3m,а=5.456Å) which is antiferromagnetic one with Neel temperature 135K.The magnetization dependences on magnetic field in the temperature range 2.4-271 K were measured and family of magnetic hysteresis loops was obtained testifying to ferromagnetic state of In1-XMnXSe solid solution. Paramagnetic constant background of magnetic susceptibility originates of atypical Van-Vleck Mn3+(d4) ions which are in a state of nonmagnetic singlet in crystal field. Very narrow (2 Oe) ESR line with g=1.999 appeared at temperatures lower 23K which is apparently due to electrons localized on the level of space quantization.The occurrence of magnetic field gradient for a series of 35x35μm2 areas in the crystal plane of InSe<Mn> was established. The change of vibrating frequency of silicon probe covered with ferromagnetic coating of cobalt was used. It was revealed that dominating area of a plane has no magnetic features. Separate inserts (1-7μm) with magnetic properties distinguished from dominating material and localized on imperfections were discovered. Taking into account magnetic measurements, RFA and XRD data they can be identified as inclusions of antiferromagnetic phases MnSe and Mn.
Presentation: Poster at E-MRS Fall Meeting 2006, Symposium E, by George V. Lashkarev
See On-line Journal of E-MRS Fall Meeting 2006
Submitted: 2006-05-15 18:13 Revised: 2009-06-07 00:44