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|Title:||Magnetic transitions in Fe2O3 nanowires|
|Authors:||DÍAZ-GUERRA Carlos; PÉREZ Luca; PIQUERAS Javier; CHIONCEL Mariana|
|Citation:||JOURNAL OF APPLIED PHYSICS vol. 106 p. 104302-104306|
|Publisher:||AMER INST PHYSICS|
|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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