Competing Exchange Interactions in the Multiferroic and Ferrimagnetic CaBaCo${}_4$O${}_7$

Abstract

Competing exchange interactions can produce complex magnetic states together with spin-induced electric polarizations. With competing interactions on alternating triangular and kagome layers, the swedenborgite CBO may have one of the largest measured spin-induced polarizations of about 1700 nC/cm${}^2$ below its ferrimagnetic transition temperature at 70 K. Powder neutron-diffraction data, magnetization measurements, and spin-wave resonance frequencies in the THz range reveal that the complex spin order of multiferroic CBO can be described as a triangular array of c-axis chains ferrimagnetically coupled to each other in the ab plane. Magnetostriction on bonds that couple those chains produces the large spin-induced polarization of CBO.

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References in corpus (5)

• Multiferroics: different ways to combine magnetism and ferroelectricity
• Competing magnetic interactions in the extended Kagome system YBaCo4O7
• Long-Range Magnetic Interactions in the Multiferroic Antiferromagnet $\mathrm{MnW}{\mathrm{O}}_4$
• CaBaCo${}_4$O${}_7$ : A ferrimagnetic pyroelectric
• Short-range Magnetic Ordering in the Geometrically Frustrated Layered Compound YBaCo4O7 with an Extended Kagomé Structure

Cited by in corpus (3)

• Giant magnetostriction and nonsaturating electric polarization up to 60 T in the polar magnet CaBaCo4O7
• Switching from pyroelectric to ferroelectric order in Ni doped CaBaCo4O7
• Terahertz frequency magnetoelectric effect in Ni doped CaBaCo${}_4$O${}_7$