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- 저자 : P. Nordblad (검색결과 2 건)
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S. S. Sikder,M. A. Hakim,S. Manjura Hoque,Md. Sultan Mahmud,P. Nordblad 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.2
The temperature and the field dependences of the magnetization have been measured for Fe73:5-xCrxCu1Nb3Si13:5B9 (0 ≤ x ≤ 17.5) prepared by using a melt spin technique. The temperature dependence of the magnetization in the range of 5 to 300 K with an applied field of 1 Tesla for all the compositions follows the relaxation M(T) = M0(1-BT3/2 -CT5/2), which is indicative of the presence of a spin wave excitation. The saturation magnetizations at 5 and 300 K decrease linearly with Cr concentration for the entire composition range, which indicates that a simple dilution of the Fe moment takes place due to Cr substitution. The field-cooled (FC) and the zero-field-cooled (ZFC)magnetizations measured with an applied field of 1 Oe show divergences for x = 10, 12.5, 15 and 17.5, which may be attributed to the magnetic hardening at low temperatures.
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Effects of Selective Dilution on the MagneticProperties of La0.7Sr0.3Mn1-xM'xO3 (M' = Al, Ti)
D. N. H. Nam,N. V. Dai,L. V. Hong,N. X. Phuc,L. V. Bau,P. Nordblad,R. S. Newrock 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
The magnetic lattice of mixed-valence Mn ions in La0:7Sr0:3MnO₃ is selectively diluted by partial substitution of Al or Ti for Mn. The ferromagnetic transition temperature Tc and the saturation magnetization Ms both decrease with substitution. By presenting the data in terms of selective dilution, Tc in the low-doping region is found to follow the relation Tc = Tc0(1..np), where Tc0 refers to the undiluted system and np is the dilution concentration dened as np = x=0:7 or np = x=0:3 for M0 = Al or Ti, respectively. The scaling behavior of Tc(np) can be analyzed in the framework of the molecular-field theory and the still valid when Mn is replaced by both Al and Ti. The results are discussed with respect to the contributions from ferromagnetic double exchange and other possible antiferromagnetic superexchange interactions coexisting in the material. The magnetic lattice of mixed-valence Mn ions in La0:7Sr0:3MnO₃ is selectively diluted by partial substitution of Al or Ti for Mn. The ferromagnetic transition temperature Tc and the saturation magnetization Ms both decrease with substitution. By presenting the data in terms of selective dilution, Tc in the low-doping region is found to follow the relation Tc = Tc0(1..np), where Tc0 refers to the undiluted system and np is the dilution concentration dened as np = x=0:7 or np = x=0:3 for M0 = Al or Ti, respectively. The scaling behavior of Tc(np) can be analyzed in the framework of the molecular-field theory and the still valid when Mn is replaced by both Al and Ti. The results are discussed with respect to the contributions from ferromagnetic double exchange and other possible antiferromagnetic superexchange interactions coexisting in the material.
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