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arXiv · 2109.11149

Giant magnetostriction and nonsaturating electric polarization up to 60 T in the polar magnet CaBaCo4O7

Yi-Sheng Chai·Jun-Zhuang Cong·Jin-Cheng He·Dan Su·Xia-Xin Ding·John Singleton·Vivien Zapf·Young Sun
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Abstract

Giant magnetostriction in insulating magnetic materials is highly required for applications but is rarely observed. Here we show that giant magnetostriction (> 1500 ppm) can be achieved in an insulating transition metal oxide CaBaCo4O7 where the ferrimagnetic ordering at TC ~ 62 K is associated with a huge change in the lattice. Moreover, because this material is pyroelectric with a non-switchable electric polarization (P), the giant magnetostriction results in a record-breaking magnetoelectric effect - a gigantic change of electric polarization (deltaP ~ 1.6 μC/cm2) in response to the applied magnetic field up to 60 T. Geometric frustration as well as the orbital instability of Co2+/Co3+ ions is believed to play a crucial role in the giant magnetostriction. Our study provides new insights on how to achieve both giant magnetostriction and pronounced magnetoelectric effect in insulating transition metal oxides.

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Yi-Sheng Chai, Jun-Zhuang Cong, Jin-Cheng He, Dan Su, Xia-Xin Ding, John Singleton, Vivien Zapf, Young Sun. 2021-09-23. Giant magnetostriction and nonsaturating electric polarization up to 60 T in the polar magnet CaBaCo4O7. https://doi.org/10.1103/physrevb.103.174433

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