TY - JOUR
T1 - Spatially resolving variations in giant magnetoresistance, undetectable with four-point probe measurements, using infrared microspectroscopy
AU - Kelley, Chris
AU - Thompson, Sarah Madeleine
AU - Illman, Matthew
AU - LeFrancois, Stephane
AU - Dumas, Paul
PY - 2012/10/16
Y1 - 2012/10/16
N2 - Magnetorefractive infrared (IR) microspectroscopy is demonstrated to resolve spatial variations in giant magnetoresistance (GMR) and, by modelling, provide an insight into the origin of the variations. Spatial variations are shown to be masked in conventional four-point probe electrical or IR spectral measurements. IR microspectroscopy was performed at the SMIS beamline at the SOLEIL synchrotron, modified to enable measurements in magnetic fields. A GMR gradient was induced in a CoFe/Cu multilayer sample by annealing in a temperature gradient. Modelling revealed that variations in GMR at 900Oe could be attributed to local variations in interlayer coupling locally changing the switching field.
AB - Magnetorefractive infrared (IR) microspectroscopy is demonstrated to resolve spatial variations in giant magnetoresistance (GMR) and, by modelling, provide an insight into the origin of the variations. Spatial variations are shown to be masked in conventional four-point probe electrical or IR spectral measurements. IR microspectroscopy was performed at the SMIS beamline at the SOLEIL synchrotron, modified to enable measurements in magnetic fields. A GMR gradient was induced in a CoFe/Cu multilayer sample by annealing in a temperature gradient. Modelling revealed that variations in GMR at 900Oe could be attributed to local variations in interlayer coupling locally changing the switching field.
UR - http://www.scopus.com/inward/record.url?scp=84867799195&partnerID=8YFLogxK
U2 - 10.1063/1.4760282
DO - 10.1063/1.4760282
M3 - Article
SN - 0003-6951
VL - 101
SP - 1
EP - 4
JO - Applied Physics Letters
JF - Applied Physics Letters
IS - 16
M1 - 162402
ER -