Scanning thermal microscope-detected ferromagnetic resonance (SThM-FMR) combines a thermal near-field microscope with a FMR spectrometer and detects the thermal response due to resonant microwave absorption by measuring the resistivity change in the thermal nanoprobe. The advantage of this technique is to provide imaging capabilities at fixed resonance conditions as well as local microwave spectroscopy at the nanoscale. A technique that uses the same setup but detects the thermoelastic response of the sample is the scanning thermoelastic microscope-detected FMR (SThEM-FMR). This latter technique is advantageous when FMR spectra of single nanostructures have to be recorded at a fixed position. The experimental setups and the signal generation processes of SThM/SThEM-FMR are described in detail. With the SThM-FMR setups a temperature resolution of and a local resolution of are actually achieved. With SThEM-FMR the obtained local resolution is . The detection limits of both techniques can be as low as spins. To demonstrate the potential of these new techniques SThM/SThEM-FMR investigations of local magnetic anisotropies, magnetization dynamics of single nanodots and inhomogeneous FMR excitations due to finite size effects are presented. Simultaneously, information on the magnetic parameters, the topography, and the thermal properties is provided. To describe the further potential of this recently developed SThM-FMR technique, combined magnetoresistance and FMR investigations are presented and an outlook on possible future applications is given.
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April 2008
Review Article|
April 24 2008
Invited Review Article: Microwave spectroscopy based on scanning thermal microscopy: Resolution in the nanometer range
Ralf Meckenstock
Ralf Meckenstock
a)
AG Farle, Fachbereich Physik and Center for Nanointegration (CeNIDE),
Universität Duisburg-Essen
, Duisburg 47048, Germany
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a)
Author to whom correspondence should be addressed. Tel.: +49 203 379-2094. Fax.: +49 203 379-2098. Electronic mail: [email protected].
Rev. Sci. Instrum. 79, 041101 (2008)
Article history
Received:
June 18 2007
Accepted:
December 17 2007
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Citation
Ralf Meckenstock; Invited Review Article: Microwave spectroscopy based on scanning thermal microscopy: Resolution in the nanometer range. Rev. Sci. Instrum. 1 April 2008; 79 (4): 041101. https://doi.org/10.1063/1.2908445
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