Magnetic transitions in Fe2O3 nanowires
Magnetic transitions in single-crystal Fe2O3 hematite nanowires, grown by thermal oxidation of
iron powder, have been studied in the range of 5-1023 K with a superconducting quantum
interference device below room temperature and with a vibrating sample magnetometer at higher
temperatures. The broad temperature range covered enables us to compare magnetic transitions in
the nanowires with the transitions reported for bulk hematite. Morin temperatures TM of the
nanowires and of hematite bulk reference powder were found to be 123 and 263 K, respectively.
Also the Néel temperature TN of the nanowires, 852 K, was lower than the bulk TN value.
Measurements of the magnetization as a function of temperature show an enhanced signal in the
nanowires, which suggests a decrease in the antiferromagnetic coupling. A coercive field observed
below TM in the hysteresis loops of the nanowires is tentatively explained by the presence of a
magnetic phase.
DÍAZ-GUERRA Carlos;
PÉREZ Luca;
PIQUERAS Javier;
CHIONCEL Mariana;
2009-12-10
AMER INST PHYSICS
JRC55976
0021-8979,
http://link.aip.org/link/?JAP/106/104302,
https://publications.jrc.ec.europa.eu/repository/handle/JRC55976,
10.1063/1.3259394,
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