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Seo, Kwanyong
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  • Flexible solar cell, transparent solar cell, PV-battery hybrid system, hetero-junction solar cell

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Magnetic properties of single-crystalline CoSi nanowires

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Title
Magnetic properties of single-crystalline CoSi nanowires
Other Titles
Magnetic properties of single-crystalline CoSi nanowires
Author
Seo, KwanyongVaradwaj, K. S. K.Mohanty, ParitoshLee, SunghunJo, YounghunJung, Myung-HwaKim, JinheeKim, Bongsoo
Keywords
FIELD-EFFECT TRANSISTORS; SI(001); FERROMAGNETS; TECHNOLOGY; SILICIDES; FUTURE; GROWTH; METAL
Issue Date
2007-05
Publisher
AMER CHEMICAL SOC
Citation
NANO LETTERS, v.7, no.5, pp.1240 - 1245
Abstract
We have observed unusual ferromagnetic properties in single-crystalline CoSi nanowire ensemble, in marked contrast to the diamagnetic CoSi in bulk. High-density freestanding CoSi nanowires with B20 crystal structure are synthesized by a vapor-transport-based method. The reaction of cobalt chloride precursor with a Si substrate produces high-aspect-ratio CoSi nanowires. The high-resolution transmission electron microscopy and electron diffraction studies reveal superlattice structure in CoSi nanowires with twice the lattice parameter of simple cubic CoSi lattice. The zero-field-cooled and field-cooled (ZFC-FC) measurements from the nanowire ensemble show freezing of the disordered surface spins at low temperatures. The magnetoresistance (MR) measurements of single nanowire devices show a negative MR whose magnitude gets larger at lower temperatures
URI
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DOI
10.1021/nl070113h
ISSN
1530-6984
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ECHE_Journal Papers
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