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

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Structure-Induced Ferromagnetic Stabilization in Free-Standing Hexagonal Fe1.3Ge Nanowires

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Title
Structure-Induced Ferromagnetic Stabilization in Free-Standing Hexagonal Fe1.3Ge Nanowires
Other Titles
Structure-Induced Ferromagnetic Stabilization in Free-Standing Hexagonal Fe1.3Ge Nanowires
Author
Yoon, HanaLee, Alex TaekyungChoi, Eun-AeSeo, KwanyongBagkar, NitinCho, JaehunJo, YounghunChang, K. J.Kim, Bongsoo
Keywords
ROOM-TEMPERATURE FERROMAGNETISM; IRON-GERMANIUM SYSTEM; AUGMENTED-WAVE METHOD; MAGNETIC-PROPERTIES; GAN NANOWIRES; ELECTRON-GAS; GROWTH; PHASE; FEGE; ENERGY
Issue Date
2010-12
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.132, no.49, pp.17447 - 17451
Abstract
Single-crystalline free-standing hexagonal Fe1.3Ge nanowires (NWs) are synthesized for the first time using a chemical vapor transport process without using any catalyst. Interestingly, Fe1.3Ge NWs are found to be ferromagnetic at room temperature, while bulk Fe1.3Ge has the lower critical temperature of 200 K. We perform first-principles density functional calculations and suggest that the observed strong ferromagnetism is attributed to the reduced distances between Fe atoms, increased number of Fe-Fe bonds, and the enhanced Fe magnetic moments. Both experimental and theoretical studies show that the magnetic moments are enhanced in the NWs, as compared to bulk Fe1.3Ge. We also modulate the composition ratio of as-grown iron germanide NWs by adjusting experimental conditions. It is shown that uniaxial strain on the hexagonal plane also enhances the ferromagnetic stability
URI
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DOI
10.1021/ja104189p
ISSN
0002-7863
Appears in Collections:
ECHE_Journal Papers
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