Magnetization-induced second harmonic generation in a polar ferromagnet.
Second harmonic generation (SHG) induced by spontaneous magnetization has been investigated for a polar ferromagnetic crystal of GaFeO3. The Kerr rotation of the second harmonic light becomes gigantic with decreasing temperature below the magnetic transition temperature (approximately =205 K), e.g., as large as 73 degrees at 100 K. The magnetic domains can be visualized by using that large nonlinear Kerr rotation. The spectrum of the magnetization-induced SHG as measured indicates the two-photon resonant electronic process on a Fe3+ ion in the crystal.
Ogawa
Y
Y
Spin Superstructure Project, ERATO, Japan Science and Technology Corporation (JST), AIST Tsukuba Central 4, Tsukuba 305-8562, Japan.
Kaneko
Y
Y
He
J P
JP
Yu
X Z
XZ
Arima
T
T
Tokura
Y
Y