This article is cited in 12 papers

Magnetism

Magnetic phase transition in $\varepsilon$-In$_x$Fe$_{2-x}$O$_3$ nanowires

A. I. Dmitriev^a, O. V. Koplak^a, A. Namai^b, H. Tokoro^b, Sh. Ohkoshi^b, R. B. Morgunov<sup>a

a</sup> Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences, Chernogolovka, Moscow region
^b Department of Chemistry, School of Science, The University of Tokyo, Tokyo, Japan

Abstract: This paper reports on a study of magnetic properties of ordered arrays of $\varepsilon$-In$_x$Fe$_{2-x}$O$_3$ ($x$ = 0.24) nanowires possessing a high room-temperature coercive force of 6 kOe. Lowering the temperature below 190 K brings about a sharp decrease of the coercive force and magnetization of nanowires driven by the magnetic phase transition from the ferrimagnetic into antiferromagnetic phase. The transition is accompanied by a decrease of the magnetic anisotropy constant, which accounts for the anomalous frequency dependence of the position of the maximum in the temperature dependence of dynamic magnetic susceptibility. In the low-temperature phase, a spin-flop transition in the magnetic field of 28 kOe has been observed at $T$ = 2 K. Lines related to the high-temperature hard-magnetic and low-temperature phases have been identified in electron spin resonance spectra of the nanowires. A line lying near zero magnetic field and evolving from the nonresonant signal related to the microwave magnetoresistance of the sample has also been detected.

Received: 16.04.2013

 English version: Physics of the Solid State, 2013, 55:11, 2140–2147

Bibliographic databases:

•