Dresden 2014 – scientific programme
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DS: Fachverband Dünne Schichten
DS 19: Multiferroics II (jointly with MA, DF,KR, TT)
DS 19.8: Talk
Wednesday, April 2, 2014, 11:30–11:45, HSZ 04
Magnetic Anisotropy in Multiferroic Lu2MnCoO6 — •Martin Lonsky1, Merlin Pohlit1, María Antonia Señarís Rodríguez2, and Jens Müller1 — 1Physikalisches Institut, Goethe-Universität, Frankfurt (M), Germany — 2Dpto. Química Fundamental U. Coruña, Coruña, Spain
Lu2MnCoO6 recently has been introduced as a new type-II multiferroic with ferroelectricity due to charge ordering and magnetostriction related to magnetic Mn4+ and Co2+ ions which are arranged alternately in the form of Ising chains along the c-axis of the crystal [1]. The magnetic properties, however, remain puzzling, which in particular is due to the lack of measurements on single crystals, that have not yet successfully been synthesized. Here, we present for the first time measurements of the magnetic anisotropy by employing micro-Hall magnetometry on a few micrograins of dimensions ∼ 1 µ m only.
Our results reveal a strong dependence of magnetic hysteresis on temperature and the applied field direction. This anisotropy is also reflected in the observation of a variety of unusual effects as for instance wasp-waisted hysteresis loops, sharp jumps in magnetization at about T=300 mK and an exchange bias, ocurring in each case in only one field direction. Additionally, the observation of a pronounced maximum in the coercive field at TSF ∼ 12 K indicates a significant change in the spin dynamics of the system below TSF, similar to the behavior of the related compound Ca3Co2−xMnxO6 (x≈0.95) [2].
S. Yáñez-Vilar et al., Phys. Rev. B. 84, 134427 (2011).
T. Lancaster et al., Phys. Rev. B 80, 020409 (2009).