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Magnetic properties of Co Core/CoO Shell and Hollow CoO NPs

등록일
2009년 8월 5일 16시 41분 01초
접수번호
0067
발표코드
34P78포 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
목 <발표Ⅰ>
발표형식
포스터
발표분야
물리화학
저자 및
공동저자
김상현, 김기섭
충주대학교 화공생물공학과, Korea
We present a magnetic properties on the magnetic structure of exchange biased Co core/CoO shell and hollos nanoparticles. Transmission electron microscopy measurements reveal that oxidation creates a Co core/CoO shell and hollos interface which is highly directional and epitaxial in quality. Neutron diffraction measurements find that below a Neel temperature of ~ 230 K the magnetization of the CoO shell is modulated by two different wave vectors, q1=(½ ½ ½) 2π/a and q2=(100) 2π/a. The large magnitude of the latter, relative to bulk CoO, is consistent with the presence of a tetragonally distorted interface region in the CoO shell, where the distortion magnitude and the related induced moment both increase with oxidation. We propose that the large exchange bias effect results from the highly ordered nature of the interface between the Co core and CoO shell, and by the enhanced core-shell coupling enabled by the uncompensated interface moment.

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