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Structural and magnetic characteristics of bismuth substituted holmium iron garnet
Author(s) -
Park Il Jin,
Kim Chul Sung
Publication year - 2007
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200777241
Subject(s) - coercivity , magnetization , materials science , mössbauer spectroscopy , bismuth , ferrimagnetism , magnetometer , diffractometer , thermoremanent magnetization , magnetic hysteresis , condensed matter physics , analytical chemistry (journal) , nuclear magnetic resonance , remanence , chemistry , magnetic field , crystallography , metallurgy , physics , chromatography , quantum mechanics , scanning electron microscope , composite material
We present the results of X‐ray diffractometer (XRD), vibrating sample magnetometer(VSM), and the Mössbauer experiments on the bismuth substituted holmium iron garnet. In zero field cooled magnetization of Ho 2 Bi 1 Fe 5 O 12 shows typical compensation phenomenon and its temperature is 80 K. But, in field cooled magnetization of Ho 2 Bi 1 Fe 5 O 12 shows negative magnetization below compensation temperature. From the analysis of VSM hysteresis loop at room temperature, the saturation magnetization and coercivity of the sample are 15.54 emu/g and 33.33 Oe, respectively. The Néel temperature ( T N ) was determined to be 650 K by Mössbauer spectroscopy. Compare with results of Tb 2 Bi 1 Fe 5 O 12 , Ho 2 Bi 1 Fe 5 O 12 has larger saturation magnetization, higher T N , and lower coercivity than Tb 2 Bi 1 Fe 5 O 12 . These phenomena can be explained by influence of the Bi ions on the superexchange interaction between a ‐ d sublattices. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)