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Giant magnetostriction and nonsaturating electric polarization up to 60 T in the polar magnet $$\mathrm{CaBaCo_4O_7}$$

Journal Article · · Physical Review. B
 [1];  [2];  [2];  [2];  [3];  [3];  [3];  [4]
  1. Chongqing University, Chongqing (China)
  2. Chinese Academy of Sciences (CAS), Beijing (China)
  3. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States). National High Magnetic Field Laboratory (MagLab)
  4. Chongqing University, Chongqing (China); Chinese Academy of Sciences (CAS), Beijing (China)
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 ~ 62K is associated with a huge change in the lattice. Moreover, because this material is pyroelectric with a nonswitchable electric polarization (P), the giant magnetostriction results in a pronounced magnetoelectric effect—a huge change of electric polarization (ΔP ~ 1.6μC/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. Here our study provides insights on how to achieve both giant magnetostriction and pronounced magnetoelectric effect in insulating transition metal oxides.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
Beijing Natural Science Foundation; National Natural Science Foundation of China; State of Florida; USDOE Office of Science (SC)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1992255
Report Number(s):
LA-UR-21-25367
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 17 Vol. 103; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

References (30)

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Low magnetic field reversal of electric polarization in a Y-type hexaferrite journal March 2012
Atomic-scale mechanisms for magnetostriction in CoFe2O4 and La0.5Sr0.5CoO3 oxides determined by differential x-ray absorption spectroscopy journal September 2019
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Gigantic magnetic-field-induced polarization and magnetoelectric coupling in a ferrimagnetic oxide CaBaCo 4 O 7 journal November 2013
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Unidirectional terahertz light absorption in the pyroelectric ferrimagnet CaBaCo 4 O 7 journal December 2015
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