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Magnetic polarons and large negative magnetoresistance in GaAs nanowires implanted with Mn ions
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- Kumar, Sandeep (author)
- Lund University,Lunds universitet,Fasta tillståndets fysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Solid State Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
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- Paschoal, Waldomiro, 1977- (author)
- Lund University,Lunds universitet,Fasta tillståndets fysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Solid State Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
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- Johannes, Andreas (author)
- Institute for Solid State Physics, Friedrich-Schiller-University Jena,Institute for Solid State Physics, Jena University, Jena, Germany
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- (creator_code:org_t)
- 2013-10-09
- 2013
- English.
- In: Nano letters (Print). - Washington, United States : American Chemical Society (ACS). - 1530-6984 .- 1530-6992. ; 13:11, s. 5079-5084
- Journal article (peer-reviewed)
Abstract
Subject headings
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- We report on low-temperature magnetotransport and SQUID measurements on heavily doped Mn-implanted GaAs nanowires. SQUID data recorded at low magnetic fields exhibit clear signs of the onset of a spin-glass phase with a transition temperature of about 16 K. Magnetotransport experiments reveal a corresponding peak in resistance at 16 K and a remarkably large negative magnetoresistance, reaching 40 % at 1.6 K and 8 T. The negative magnetoresistance decreases at elevated temperatures and vanishes at about 100 K. We interpret our transport data in terms of spin-dependent hopping in a complex magnetic nanowire landscape of magnetic polarons forming a paramagnetic/spin-glass phase.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Nanoteknik -- Nanoteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Nano-technology -- Nano-technology (hsv//eng)
Keyword
- Nanowires
- self-assembly
- ion-implantation
- GaMnAs
- spintronics
- magnetic polarons
- spin-glass
- Condensed Matter Physics
- Kondenserade materians fysik
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- ref (subject category)
- art (subject category)
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- Wang, Chih-Han
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