Ferromagnetic Ge1−xMx (M = Mn, Fe, and Co) Nanowires
- Authors
- Cho, Yong Jae; Kim, Chang Hyun; Kim, Han Sung; Lee, Wang Su; Park, Seong-Hun; Park, Jeunghee; Bae, Seung Yong; Kim, Bongsoo; Lee, Hangil; Kim, Jae-Young
- Issue Date
- Jul-2008
- Publisher
- ACS
- Citation
- Chemistry of Materials, v.20, no.14, pp 4694 - 4702
- Pages
- 9
- Journal Title
- Chemistry of Materials
- Volume
- 20
- Number
- 14
- Start Page
- 4694
- End Page
- 4702
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/148196
- DOI
- 10.1021/cm7035635
- ISSN
- 0897-4756
- Abstract
- We synthesized Ge and Ge1−xMx (M = Mn, Co, and Fe, x ≤ 0.4) nanowires using the thermal vapor transport method. All of the nanowires consisted of single-crystalline Ge nanocrystals grown uniformly with the [111] direction. High-resolution X-ray diffraction showed no metal cluster formation for any of the Ge1−xMx nanowires, and the reduction of the lattice constant for the Mn-substituted nanowires. X-ray absorption spectroscopy and X-ray magnetic circular dichroism measurements revealed that the Mn2+ ions preferentially occupy the tetrahedral sites, substituting for Ge. The magnetic moment of the Mn ions reaches a maximum for x = 0.1, which is much larger than that of the Fe or Co ions. The magnetic hysteresis confirms the room-temperature ferromagnetism of the Ge1−xMnx nanowires, which is also maximized at x = 0.1. We suggest that the Mn ions produce dopant−acceptor hybridization with host defects in the p-type Ge nanowires. The Mn substitution is more effective to form significant ferromagnetic Ge nanowires, compared to the Fe or Co substitution.
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