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Paschoal Jr., W., Kumar, S., Jacobsson, D., Johannes, A., Jain, V., Canali, C. M., . . . Pettersson, H. (2014). Magnetoresistance in Mn ion-implanted GaAs:Zn nanowires. Applied Physics Letters, 104(15), Article ID 153112.
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2014 (engelsk)Inngår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 104, nr 15, artikkel-id 153112Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We have investigated the magnetoresistance (MR) in a series of Zn doped (p-type) GaAs nanowires implanted with different Mn concentrations. The nanowires with the lowest Mn concentration (~0.0001%) exhibit a low resistance of a few kΩ at 300K and a 4% positive MR at 1.6K, which can be well described by invoking a spin-split subband model. In contrast, nanowires with the highest Mn concentration (4%) display a large resistance of several MΩ at 300K and a large negative MR of 85% at 1.6K. The large negative MR is interpreted in terms of spin-dependent hopping in a complex magnetic nanowire landscape of magnetic polarons, separated by intermediate regions of Mn impurity spins. Sweeping the magnetic field back and forth for the 4% sample reveals a hysteresis that indicates the presence of a weak ferromagnetic phase. We propose co-doping with Zn to be a promising way to reach the goal of realizing ferromagnetic Ga1-xMnxAs nanowires for future nanospintronics. © 2014 AIP Publishing LLC.

sted, utgiver, år, opplag, sider
New York: American Institute of Physics (AIP), 2014
Nanospintronics, Ion-implantation, GaMnAs, Nanowires, hopping transport, Negative magnetoresistance
HSV kategori
urn:nbn:se:hh:diva-25126 (URN)10.1063/1.4870423 (DOI)000335145200060 ()2-s2.0-84899622402 (Scopus ID)
Swedish Research CouncilKnut and Alice Wallenberg FoundationSwedish Foundation for Strategic Research

W. Paschoal, Jr. and S. Kumar contributed equally to this work and are co-first authors. The authors acknowledge financial support from nmC@LU, the Swedish Research Council (VR), the Knut and Alice Wallenberg Foundation, the Swedish National Board for Industrial, Technological Development, the Swedish Foundation for Strategic Research, the Nordforsk research network “Nanospintronics; theory and simulations,” and the German Research Society (DFG) Project Ro1198/14. One of the authors, W.P., Jr., gratefully acknowledges financial support from the Pará Education Secretary (SEDUC) and the Pará Government School (EGPA).

Tilgjengelig fra: 2014-04-22 Laget: 2014-04-22 Sist oppdatert: 2018-04-03bibliografisk kontrollert
ORCID-id: ORCID iD iconorcid.org/0000-0002-7831-7214