Magnetic Polarons and Large Negative Magnetoresistance in GaAs Nanowires Implanted with Mn Ions.

Sandeep Kumar; Waldomiro Paschoal; Andreas Johannes; Daniel Jacobsson; Christian Borschel; Anna Pertsova; Chih-Han Wang; Maw-Kuen Wu; Carlo M Canali; Carsten Ronning; Lars Samuelson; Håkan Pettersson

doi:10.1021/nl402229r

Magnetic Polarons and Large Negative Magnetoresistance in GaAs Nanowires Implanted with Mn Ions.

Sandeep Kumar, Waldomiro Paschoal, Andreas Johannes, Daniel Jacobsson, Christian Borschel, Anna Pertsova, Chih-Han Wang, Maw-Kuen Wu, Carlo M Canali, Carsten Ronning, Lars Samuelson, Håkan Pettersson

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Abstract

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 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, separated by intermediate regions of Mn impurity spins, forming a paramagnetic/spin-glass phase.

Original language	English
Pages (from-to)	5079-5084
Journal	Nano Letters
Volume	13
Issue number	11
DOIs	https://doi.org/10.1021/nl402229r
Publication status	Published - 2013

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Nano-technology

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title = "Magnetic Polarons and Large Negative Magnetoresistance in GaAs Nanowires Implanted with Mn Ions.",

abstract = "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 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, separated by intermediate regions of Mn impurity spins, forming a paramagnetic/spin-glass phase.",

author = "Sandeep Kumar and Waldomiro Paschoal and Andreas Johannes and Daniel Jacobsson and Christian Borschel and Anna Pertsova and Chih-Han Wang and Maw-Kuen Wu and Canali, {Carlo M} and Carsten Ronning and Lars Samuelson and H{\aa}kan Pettersson",

year = "2013",

doi = "10.1021/nl402229r",

language = "English",

volume = "13",

pages = "5079--5084",

journal = "Nano Letters",

issn = "1530-6992",

publisher = "The American Chemical Society (ACS)",

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TY - JOUR

T1 - Magnetic Polarons and Large Negative Magnetoresistance in GaAs Nanowires Implanted with Mn Ions.

AU - Kumar, Sandeep

AU - Paschoal, Waldomiro

AU - Johannes, Andreas

AU - Jacobsson, Daniel

AU - Borschel, Christian

AU - Pertsova, Anna

AU - Wang, Chih-Han

AU - Wu, Maw-Kuen

AU - Canali, Carlo M

AU - Ronning, Carsten

AU - Samuelson, Lars

AU - Pettersson, Håkan

PY - 2013

Y1 - 2013

N2 - 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 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, separated by intermediate regions of Mn impurity spins, forming a paramagnetic/spin-glass phase.

AB - 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 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, separated by intermediate regions of Mn impurity spins, forming a paramagnetic/spin-glass phase.

U2 - 10.1021/nl402229r

DO - 10.1021/nl402229r

M3 - Article

C2 - 24093475

SN - 1530-6992

VL - 13

SP - 5079

EP - 5084

JO - Nano Letters

JF - Nano Letters

IS - 11

ER -

Magnetic Polarons and Large Negative Magnetoresistance in GaAs Nanowires Implanted with Mn Ions.

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