Thermally or magnetically induced polarization reversal in the Multiferroic CoCr2O4.
We report the unexpected evolution, with thermal and magnetic-field (H) variations, of the interrelation between the polarization P, magnetization M, and spiral wave vector Q in CoCr2O4, which has a ferrimagnetic conical-spiral magnetic order. For example, P suddenly jumps and changes its sign at the magnetic lock-in transition (T_{L}) with thermal variation, or with isothermal variation of H (without changing its direction) at T_{L}, which surprisingly occurs without change in spiral handedness (i.e., the sign of Q). The presence of multiple spiral sublattices may be behind this unusual behavior.
Choi
Y J
YJ
Rutgers Center for Emergent Materials and Department of Physics and Astronomy, 136 Frelinghuysen Road, Piscataway, New Jersey 08854, USA.
Okamoto
J
J
Huang
D J
DJ
Chao
K S
KS
Lin
H J
HJ
Chen
C T
CT
van Veenendaal
M
M
Kaplan
T A
TA
Cheong
S-W
SW