Nature of Ho magnetism in multiferroic HoMnO3.
Using x-ray resonant magnetic scattering and x-ray magnetic circular dichroism, techniques that are element specific, we have elucidated the role of Ho3+ in multiferroic HoMnO3. In zero field, Ho3+ orders antiferromagnetically with moments aligned along the hexagonal c direction below 40 K, and undergoes a transition to another magnetic structure below 4.5 K. In applied electric fields of up to 1 x 10(7) V/m, the magnetic structure of Ho3+ remains unchanged.
Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.
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Nandi
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Tan
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Kim
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Yan
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Lang
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Haskel
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McQueeney
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Goldman