β-Detected NMR Search for Magnetic Phase Separation in Epitaxial GaAs: Mn

Q. Song; K. H. Chow; R. I. Miller; I. Fan; M. D. Hossain; R. F. Kiefl; G. D. Morris; S. R. Kreitzman; C. D P Levy; T. J. Parolin; M. R. Pearson; Z. Salman; H. Saadaoui; M. Smadella; D. Wang; K. M. Yu; X. Liu; J. K. Furdyna; W. A. Macfarlane

doi:10.1016/j.phpro.2012.04.066

β-Detected NMR Search for Magnetic Phase Separation in Epitaxial GaAs: Mn

Q. Song^*, K. H. Chow, R. I. Miller, I. Fan, M. D. Hossain, R. F. Kiefl, G. D. Morris, S. R. Kreitzman, C. D P Levy, T. J. Parolin, M. R. Pearson, Z. Salman, H. Saadaoui, M. Smadella, D. Wang, K. M. Yu, X. Liu, J. K. Furdyna, W. A. Macfarlane

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 22 - Publication in policy or professional journal

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Abstract

To test for the microscopic magnetic phase separation in the dilute magnetic semiconductor Ga_1-xMn_xAs sug-gested by low energy muon spin rotation measurements[1], we present a detailed analysis of the amplitudes of the ⁸Li β-detected nuclear magnetic resonance in an epitaxially grown thin film of x = 5.4% Mn doped GaAs on a semi-insulating GaAs substrate with magnetic transition temperature T_C =72 K. The spectrum at 100 K corresponds to 73% of the full room temperature amplitude, and at 60 K to about 62%. The 11% loss of signal through the magnetic tran-sition is much smaller than that ∼ 50% found by low energy μSR[1], and may be entirely due to an amplitude change intrinsic to GaAs. This lack of evidence for phase separation is, however, consistent with the full volume fraction magnetism found by a second low energy μSR measurement on a different sample using weak transverse field[2].

Original language	English
Pages (from-to)	174-177
Journal	Physics Procedia
Volume	30
DOIs	https://doi.org/10.1016/j.phpro.2012.04.066
Publication status	Published - 2012
Externally published	Yes
Event	12th International Conference on Muon Spin Rotation, Relaxation and Resonance, muSR 2011 - Cancun, Mexico Duration: 16 May 2011 → 20 May 2011 http://www.sciencedirect.com/science/journal/18753892/30/supp/C (unknown)

Research Keywords

dilute magnetic semiconductors
GaAs:Mn
low energy muons
thin films

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This full text is made available under CC-BY-NC-ND 4.0. https://creativecommons.org/licenses/by-nc-nd/4.0/

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Song, Q., Chow, K. H., Miller, R. I., Fan, I., Hossain, M. D., Kiefl, R. F., Morris, G. D., Kreitzman, S. R., Levy, C. D. P., Parolin, T. J., Pearson, M. R., Salman, Z., Saadaoui, H., Smadella, M., Wang, D., Yu, K. M., Liu, X., Furdyna, J. K., & Macfarlane, W. A. (2012). β-Detected NMR Search for Magnetic Phase Separation in Epitaxial GaAs: Mn. Physics Procedia, 30, 174-177. https://doi.org/10.1016/j.phpro.2012.04.066

@article{c0c66eae2b604a9fa945b382e58ce088,

title = "β-Detected NMR Search for Magnetic Phase Separation in Epitaxial GaAs: Mn",

abstract = "To test for the microscopic magnetic phase separation in the dilute magnetic semiconductor Ga1-xMnxAs sug-gested by low energy muon spin rotation measurements[1], we present a detailed analysis of the amplitudes of the 8Li β-detected nuclear magnetic resonance in an epitaxially grown thin film of x = 5.4% Mn doped GaAs on a semi-insulating GaAs substrate with magnetic transition temperature TC =72 K. The spectrum at 100 K corresponds to 73% of the full room temperature amplitude, and at 60 K to about 62%. The 11% loss of signal through the magnetic tran-sition is much smaller than that ∼ 50% found by low energy μSR[1], and may be entirely due to an amplitude change intrinsic to GaAs. This lack of evidence for phase separation is, however, consistent with the full volume fraction magnetism found by a second low energy μSR measurement on a different sample using weak transverse field[2].",

keywords = "dilute magnetic semiconductors, GaAs:Mn, low energy muons, thin films",

author = "Q. Song and Chow, {K. H.} and Miller, {R. I.} and I. Fan and Hossain, {M. D.} and Kiefl, {R. F.} and Morris, {G. D.} and Kreitzman, {S. R.} and Levy, {C. D P} and Parolin, {T. J.} and Pearson, {M. R.} and Z. Salman and H. Saadaoui and M. Smadella and D. Wang and Yu, {K. M.} and X. Liu and Furdyna, {J. K.} and Macfarlane, {W. A.}",

year = "2012",

doi = "10.1016/j.phpro.2012.04.066",

language = "English",

volume = "30",

pages = "174--177",

journal = "Physics Procedia",

issn = "1875-3884",

publisher = "Elsevier B.V.",

note = "12th International Conference on Muon Spin Rotation, Relaxation and Resonance, muSR 2011 ; Conference date: 16-05-2011 Through 20-05-2011",

url = "http://www.sciencedirect.com/science/journal/18753892/30/supp/C",

}

Song, Q, Chow, KH, Miller, RI, Fan, I, Hossain, MD, Kiefl, RF, Morris, GD, Kreitzman, SR, Levy, CDP, Parolin, TJ, Pearson, MR, Salman, Z, Saadaoui, H, Smadella, M, Wang, D, Yu, KM, Liu, X, Furdyna, JK & Macfarlane, WA 2012, 'β-Detected NMR Search for Magnetic Phase Separation in Epitaxial GaAs: Mn', Physics Procedia, vol. 30, pp. 174-177. https://doi.org/10.1016/j.phpro.2012.04.066

TY - JOUR

T1 - β-Detected NMR Search for Magnetic Phase Separation in Epitaxial GaAs

T2 - 12th International Conference on Muon Spin Rotation, Relaxation and Resonance, muSR 2011

AU - Song, Q.

AU - Chow, K. H.

AU - Miller, R. I.

AU - Fan, I.

AU - Hossain, M. D.

AU - Kiefl, R. F.

AU - Morris, G. D.

AU - Kreitzman, S. R.

AU - Levy, C. D P

AU - Parolin, T. J.

AU - Pearson, M. R.

AU - Salman, Z.

AU - Saadaoui, H.

AU - Smadella, M.

AU - Wang, D.

AU - Yu, K. M.

AU - Liu, X.

AU - Furdyna, J. K.

AU - Macfarlane, W. A.

PY - 2012

Y1 - 2012

N2 - To test for the microscopic magnetic phase separation in the dilute magnetic semiconductor Ga1-xMnxAs sug-gested by low energy muon spin rotation measurements[1], we present a detailed analysis of the amplitudes of the 8Li β-detected nuclear magnetic resonance in an epitaxially grown thin film of x = 5.4% Mn doped GaAs on a semi-insulating GaAs substrate with magnetic transition temperature TC =72 K. The spectrum at 100 K corresponds to 73% of the full room temperature amplitude, and at 60 K to about 62%. The 11% loss of signal through the magnetic tran-sition is much smaller than that ∼ 50% found by low energy μSR[1], and may be entirely due to an amplitude change intrinsic to GaAs. This lack of evidence for phase separation is, however, consistent with the full volume fraction magnetism found by a second low energy μSR measurement on a different sample using weak transverse field[2].

AB - To test for the microscopic magnetic phase separation in the dilute magnetic semiconductor Ga1-xMnxAs sug-gested by low energy muon spin rotation measurements[1], we present a detailed analysis of the amplitudes of the 8Li β-detected nuclear magnetic resonance in an epitaxially grown thin film of x = 5.4% Mn doped GaAs on a semi-insulating GaAs substrate with magnetic transition temperature TC =72 K. The spectrum at 100 K corresponds to 73% of the full room temperature amplitude, and at 60 K to about 62%. The 11% loss of signal through the magnetic tran-sition is much smaller than that ∼ 50% found by low energy μSR[1], and may be entirely due to an amplitude change intrinsic to GaAs. This lack of evidence for phase separation is, however, consistent with the full volume fraction magnetism found by a second low energy μSR measurement on a different sample using weak transverse field[2].

KW - dilute magnetic semiconductors

KW - GaAs:Mn

KW - low energy muons

KW - thin films

UR - http://www.scopus.com/inward/record.url?scp=84978538774&partnerID=8YFLogxK

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-84978538774&origin=recordpage

U2 - 10.1016/j.phpro.2012.04.066

DO - 10.1016/j.phpro.2012.04.066

M3 - RGC 22 - Publication in policy or professional journal

SN - 1875-3884

VL - 30

SP - 174

EP - 177

JO - Physics Procedia

JF - Physics Procedia

Y2 - 16 May 2011 through 20 May 2011

ER -

β-Detected NMR Search for Magnetic Phase Separation in Epitaxial GaAs: Mn

Abstract

Research Keywords

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