Spin and orbital magnetic moments of Fe3O4.
We present measurements of the spin and orbital magnetic moments of Fe3O4 by using SQUID and magnetic circular dichroism in soft x-ray absorption. The measurements show that Fe3O4 has a noninteger spin moment, in contrast to its predicted half-metallic feature. Fe3O4 also exhibits a large unquenched orbital moment. Calculations using the local density approximation including the Hubbard U method and the configuration interaction cluster-model suggest that strong correlations and spin-orbit interaction of the 3d electrons result in the noninteger spin and large orbital moments of Fe3O4.
National Synchrotron Radiation Research Center, Hsinchu 30077, Taiwan.
D J
DJ
Huang
C F
CF
Chang
H-T
HT
Jeng
G Y
GY
Guo
H-J
HJ
Lin
W B
WB
Wu
H C
HC
Ku
A
A
Fujimori
Y
Y
Takahashi
C T
CT
Chen