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Soft X-ray magnetic circular dichroism of Cr-doped GaN
H.Makino,J.J.Kim,T.Nakamura,T.Muro,K.Kobayashi,T.Yao 한국물리학회 2004 Current Applied Physics Vol.4 No.6
Soft X-ray magnetic circular dichroism (XMCD) have been measured for the Ga0:97Cr0:03N lm grown by NH3-assistedmolecular beam epitaxy. Temperature dependence of the XMCD intensity was well described by the CurieWeiss law. Although thesample showed ferromagnetic behavior at least up to room temperature, the ferromagnetic component could not be detected by the XMCD measurement.
C.Harada,H.Makino,H.Goto,T.Minegishi,T.Suzuki,M.W.Cho,T.Yao 한국물리학회 2004 Current Applied Physics Vol.4 No.6
We report on a surface property of bulk ZnO crystals and an optical method to evaluate it. Bulk ZnO crystals have a damagedsurface layer due to chemomechanical polishing. We prepared the ZnO crystals by etching, and evaluated the improvement of thesurface by high-resolution X-ray diraction (XRD) and photoluminescence (PL). In PL measurements, the relative intensity of therst order longitudinal optical phonon replica of free exciton (FX-1LO) to second order process (FX-2LO) was compared. Therelative intensity becomes weak with increasing etched depth and nally saturates at the etched depth of 5l m. This result agrees wellwith XRD results.