Photovoltage detection of x-ray absorption and magnetic circular dichroism spectra of magnetic films grown on semiconductors

J J Mallett; E Dudzik; W Schwarzacher; S M Thompson; H K Tsang; G van der Laan

doi:10.1063/1.1537453

Photovoltage detection of x-ray absorption and magnetic circular dichroism spectra of magnetic films grown on semiconductors

J J Mallett, E Dudzik, W Schwarzacher, S M Thompson, H K Tsang, G van der Laan

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

We describe a measurement technique for x-ray absorption spectroscopy, in which the sample is used as the detector. Co L-2,L-3 absorption spectra were taken from cobalt films grown on n-GaAs by measuring the photovoltage generated by the x rays transmitted across the rectifying metal-semiconductor contact. After correcting the effects of signal saturation good agreement was obtained with spectra acquired using the conventional total electron yield method. X-ray magnetic circular dichroism measurements using the method gave values for the spin moment of cobalt between 1.48 and 1.89 mu(B)/atom, compared to the value in the literature of 1.55 mu(B)/atom for the bulk. An anomalously high average value of 0.39 mu(B)/atom was found for the orbital moment and attributed to the presence of oxide in the films. (C) 2003 American Institute of Physics.

Original language	English
Pages (from-to)	2028-2033
Number of pages	6
Journal	Journal of Applied Physics
Volume	93
Issue number	4
DOIs	https://doi.org/10.1063/1.1537453
Publication status	Published - 15 Feb 2003

Keywords

SUM-RULES
FE
SPECTROSCOPY
YIELD
CO

Access to Document

10.1063/1.1537453

Cite this

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title = "Photovoltage detection of x-ray absorption and magnetic circular dichroism spectra of magnetic films grown on semiconductors",

abstract = "We describe a measurement technique for x-ray absorption spectroscopy, in which the sample is used as the detector. Co L-2,L-3 absorption spectra were taken from cobalt films grown on n-GaAs by measuring the photovoltage generated by the x rays transmitted across the rectifying metal-semiconductor contact. After correcting the effects of signal saturation good agreement was obtained with spectra acquired using the conventional total electron yield method. X-ray magnetic circular dichroism measurements using the method gave values for the spin moment of cobalt between 1.48 and 1.89 mu(B)/atom, compared to the value in the literature of 1.55 mu(B)/atom for the bulk. An anomalously high average value of 0.39 mu(B)/atom was found for the orbital moment and attributed to the presence of oxide in the films. (C) 2003 American Institute of Physics.",

keywords = "SUM-RULES, FE, SPECTROSCOPY, YIELD, CO",

author = "Mallett, {J J} and E Dudzik and W Schwarzacher and Thompson, {S M} and Tsang, {H K} and {van der Laan}, G",

year = "2003",

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volume = "93",

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journal = "Journal of Applied Physics",

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TY - JOUR

T1 - Photovoltage detection of x-ray absorption and magnetic circular dichroism spectra of magnetic films grown on semiconductors

AU - Mallett, J J

AU - Dudzik, E

AU - Schwarzacher, W

AU - Thompson, S M

AU - Tsang, H K

AU - van der Laan, G

PY - 2003/2/15

Y1 - 2003/2/15

N2 - We describe a measurement technique for x-ray absorption spectroscopy, in which the sample is used as the detector. Co L-2,L-3 absorption spectra were taken from cobalt films grown on n-GaAs by measuring the photovoltage generated by the x rays transmitted across the rectifying metal-semiconductor contact. After correcting the effects of signal saturation good agreement was obtained with spectra acquired using the conventional total electron yield method. X-ray magnetic circular dichroism measurements using the method gave values for the spin moment of cobalt between 1.48 and 1.89 mu(B)/atom, compared to the value in the literature of 1.55 mu(B)/atom for the bulk. An anomalously high average value of 0.39 mu(B)/atom was found for the orbital moment and attributed to the presence of oxide in the films. (C) 2003 American Institute of Physics.

AB - We describe a measurement technique for x-ray absorption spectroscopy, in which the sample is used as the detector. Co L-2,L-3 absorption spectra were taken from cobalt films grown on n-GaAs by measuring the photovoltage generated by the x rays transmitted across the rectifying metal-semiconductor contact. After correcting the effects of signal saturation good agreement was obtained with spectra acquired using the conventional total electron yield method. X-ray magnetic circular dichroism measurements using the method gave values for the spin moment of cobalt between 1.48 and 1.89 mu(B)/atom, compared to the value in the literature of 1.55 mu(B)/atom for the bulk. An anomalously high average value of 0.39 mu(B)/atom was found for the orbital moment and attributed to the presence of oxide in the films. (C) 2003 American Institute of Physics.

KW - SUM-RULES

KW - FE

KW - SPECTROSCOPY

KW - YIELD

KW - CO

U2 - 10.1063/1.1537453

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