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.

arXiv comment3 figures

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Cited by in corpus (6)

• Giant magnetostriction and nonsaturating electric polarization up to 60 T in the polar magnet CaBaCo4O7
• Enhancement of giant magnetoelectric effect in Ni-doped CaBaCo${}_4$O${}_7$
• Switching from pyroelectric to ferroelectric order in Ni doped CaBaCo4O7
• Terahertz frequency magnetoelectric effect in Ni doped CaBaCo${}_4$O${}_7$
• Remarkable effects of dopant valency $-$ a comparative study of CaBaCo${}_{3.96}$Cr${}_{0.04}$O${}_7$ and CaBaCo${}_{3.96}$Ni${}_{0.04}$O${}_7$
• Structural, magnetic and electric polarization properties of geometrically frustrated YBaCo4O7 and DyBaCo4O7 cobaltites