Title: Magnetic transitions in Fe2O3 nanowires
Authors: DÍAZ-GUERRA CarlosPÉREZ LucaPIQUERAS JavierCHIONCEL Mariana
Citation: JOURNAL OF APPLIED PHYSICS vol. 106 p. 104302-104306
Publisher: AMER INST PHYSICS
Publication Year: 2009
JRC N°: JRC55976
ISSN: 0021-8979
URI: http://link.aip.org/link/?JAP/106/104302
http://publications.jrc.ec.europa.eu/repository/handle/JRC55976
DOI: 10.1063/1.3259394
Type: Articles in periodicals and books
Abstract: 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.
JRC Directorate:Growth and Innovation

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