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Temperature-induced magnetization reversal in a YVO3 single crystal

Nature volume 396, pages 441–444 (1998)Cite this article

Abstract

The total energy of a magnet in a magnetic field is lowest when the magnetic moment is aligned parallel to the magnetic field. Once aligned, the magnetic moment can be reversed by applying a sufficiently large field in the opposite direction. These properties form the basis of most magnetic recording and storage devices. But the phenomenon of magnetization reversal in response to a change in temperature (in a small magnetic field) is rarer. This effect occurs in some ferrimagnetic materials consisting of two or more types of antiferromagnetically ordered magnetic ions1, and forms the operational basis of ferrimagnetic insulators. Here we report the observation of multiple temperature-induced magnetization reversals in YVO3. The net magnetic moment is caused by a tilting of the antiferromagnetically aligned moments of (crystallographically identical) V3+ ions, due to orthorhombic distortion in the crystal structure. We observe an abrupt switching at 77 K associated with a first-order structural phase transition, and a gradual reversal at ∼95 K without an accompanying structural change. The magnetization always reverses if the crystal is cooled or warmed through these two temperatures in modest fields. We propose a possible mechanism involving a change in orbital ordering which may be generic to a broad class of transition metal oxides.

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Figure 1: Temperature dependence of the magnetization in an applied magnetic field of 1 kOe along the a-, b- and c-axes, respectively.
Figure 2: Magnetization versus temperature in a field of 100 Oe, demonstrating the memory effect upon the application of large fields.
Figure 3: Pictorial view of the temperature dependence of the magnetization.
Figure 4: Suggested orbital ordering below and above Ts = 77 K.

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Acknowledgements

We thank J. B. Goodenough for discussion of the results and for explaining his ideas on the origin of the magnetization reversal in LaVO3; we also thank J. Rodriquez-Carvajal and E. F. Bertaut for discussion. This work is supported by the Netherlands Foundation for the Fundamental Research of Matter (FOM) and the Dutch Organization for the Advancement of Pure Research (NWO), and in part by EU (OXSEN).

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Authors and Affiliations

  1. Solid State Physics Laboratory, Materials Science Centre, University of Groningen, Nijenborgh 4, 9747, AG Groningen, The Netherlands

    Y. Ren, D. I. Khomskii, E. Pellegrin & G. A. Sawatzky

  2. Inorganic Solid State Chemistry Laboratory, Materials Science Centre, University of Groningen, Nijenborgh 4, 9747, AG Groningen, The Netherlands

    T. T. M. Palstra

  3. Van der Waals-Zeeman Institute, University of Amsterdam, Valckenierstaart 65, 1018 XE, Amsterdam, The Netherlands

    A. A. Nugroho & A. A. Menovsky

  4. Jurusan Fisika, Fakultas Matematika dan Ilmu Pengetahuan Alam, Institut Teknologi Bandung, Indonesia

    A. A. Nugroho

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  1. Y. Ren
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Ren, Y., Palstra, T., Khomskii, D. et al. Temperature-induced magnetization reversal in a YVO3 single crystal. Nature 396, 441–444 (1998). https://doi.org/10.1038/24802

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