Magnetoelectric effect and magnetic phase diagram of a polar ferrimagnet CaBaFe4O7

Kocsis, Vilmos and Tokunaga, Yusuke and Bordács, Sándor and Kriener, Markus and Puri, A. and Zeitler, Uli and Taguchi, Yasujiro and Tokura, Yoshinori and Kézsmárki, István (2016) Magnetoelectric effect and magnetic phase diagram of a polar ferrimagnet CaBaFe4O7. PHYSICAL REVIEW B CONDENSED MATTER AND MATERIALS PHYSICS. pp. 1-20. ISSN 1098-0121

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Abstract

The magnetic phase diagram of a polar ferrimagnet CaBaFe4O7 with a magnetic easy axis has been investigated by measurements of magnetization, specific heat, and magnetoelectricity. A ferrimagnetic transition takes place at TC1=275 K within the orthorhombic phase followed by a second magnetic transition at TC2=211 K. Below TC2, successive metamagnetic transitions occur for magnetic fields applied perpendicular to the easy axis, implying a sequential emergence of magnetic states which are neither collinear nor coplanar. The observation of the static magnetoelectric effect was limited to temperatures below 120 K due to the conducting nature of the crystals at higher temperatures. The magnitude of the ferroelectric polarization shows large changes between the different field-induced magnetic phases. The low-field state is characterized by a large linear magnetoelectric coefficient of αcc=39 ps/m, while a gigantic polarization change of ΔP=850μC/m2 is observed for μoH=14 T applied along the easy axis.

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