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Ferromagnetism in 57 Fe‐doped cupric oxide
Author(s) -
Park Young Ran,
Kim Kwang Joo,
Choi Seungli,
Lee Jung Han,
Lee Hee Jung,
Kim Chul Sung,
Park Jae Yun
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.200777116
Subject(s) - ferromagnetism , unpaired electron , materials science , paramagnetism , vacancy defect , spins , ion , doping , oxide , octahedron , condensed matter physics , analytical chemistry (journal) , crystallography , inorganic chemistry , chemistry , nuclear magnetic resonance , electron paramagnetic resonance , metallurgy , physics , optoelectronics , organic chemistry , chromatography
Ferromagnetic properties were observed at room temperature for 57 Fe‐doped cupric oxide (CuO) film and powder samples. Mössbauer spectroscopy measurements on the Fe 0.02 Cu 0.98 O samples revealed that the octahedral Cu 2+ sites are mostly substituted by Fe 3+ ions. Both ferromagnetic and paramagnetic Fe 3+ signals were detected. The Fe 0.02 Cu 0.98 O samples were found to be ferromagnetic even above the Néel temperature of CuO. A carrier localized around oxygen vacancy can mediate a ferromagnetic coupling among neighboring Fe 3+ ions. Additional Li doping into Fe 0.02 Cu 0.98 O resulted in an increase of the ferromagnetic strength. Unpaired s 1 electron in interstitial Li atom is likely to mediate a ferromagnetic coupling between neighboring spins. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)