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Fe³+ 불순물이 첨가된 LiTaO₃ 단결정에서의 전자 상자성 공명 연구
민성기(S. G. Min),염태호(T. H. Yeom),이수형(S. H. Lee),이명규(M. K. Lee),신현권(H. K. Shin),유영문(Y. M. Yu),김태훈(T. H. Kim),유성초(S. C. Yu) 한국자기학회 2003 韓國磁氣學會誌 Vol.13 No.4
Electron paramagnetic resonance (EPR) of Fe³+ in LiTaO₃ single crystal, grown by Czochralski method, has been studied by employing an X-band spectrometer. Resonance spectra of Fe³+ ion on the crystallographic principal axes were obtained with 9.447 ㎓ at room temperature. The spectroscopic splitting parameter g and zero-field splitting (ZFS) parameter D (= 3 B^0₂) are calculated with effective spin Hamiltonian. Fe³+ center in stoichometric single crystal turns out to be different with that in congruent single crystal reported previously. From the analysis of temperature dependence of resonance fields for Fe³+ ion, there is no any phase transition at the temperature range (from -160 ℃ to 20 ℃).
기계적 합금화한 비정질 Fe50Zr50 분말의 자기특성
이성의(S. E. Lee),나형용(H. Y. Ra),김원태(W. T. Kim),유성초(S. C. Yu) 한국자기학회 1997 韓國磁氣學會誌 Vol.7 No.1
Amorphous Fe_(50)Zr_(50) alloy has been manufactured by mechanical alloying from pure elemental powders of Fe and Zr in a conventional ball mill under an Ar atmosphere. Structure and magnetic properties of the amorphous phase were studied by transmission electron microscopy and SQUID magnetometry. Selected area diffraction patterns taken from the mechanically alloyed powders showed two halo rings, indicating coexistence of Fe rich and Zr rich amorphous phases in mechanically alloyed powder. Curie temperature of the Fe rich amorphous phase, measured by Arrot plot, was 195 K. Fe content in the ferromagnetic amorphous phase, estimated from the Curie temperature, was about 65 at%. Spin wave stiffness constant of Fe_(50)Zr_(50) alloys processed for 100 and 200 hrs were 52.2 and 63.8 meV, respectively. The higher spin wave stiffness constant in 200 hrs milled powders may arise from the precipitation of α-Fe by partial crystallization of amorphous phase.