Ferromagnetic Resonance Spectroscopy with a Micromechanical Calorimeter Sensor

Published

August 1, 2000

Author(s)

John M. Moreland, M. Loehndorf, Pavel Kabos, Robert McMichael

Abstract

We describe a new type of ferromagnetic resonance (FMR) spectroscopy that is based on a calorimeter sensor. We use an atomic force microscopy cantilever coated with a ferromagnetic thin film as a bimaterial sensor to measure absorption of microwaves at 9.17 GHz. The spectra show a peak in the cantilever deflection as a function of applied magnetic field corresponding to a peak in the absorbed microwave power that occurs at the FMR resonance of the ferromagnetic film. The saturation magnetization M_3ff and the damping factor α were determined from the FMR microwave absorption spectra for Co, NiFe, and Ni thin films. The data correlate well with conventional FMR spectra taken with a tuned cavity spectrometer. Our instrument can detect magnetic moments as small as 1.3 c 10^-12 A m² (1.3X10^{-9 emu) with prospects for snesitivity improvements to the 1 x 10}u-16^ Am² (1X10^-12_emu) level. The technique provides a potentially superior way to make quantitative measurements of saturation magnetization of thin-film samples with very small total magnetic moments.

Citation

Review of Scientific Instruments

Volume

71

Issue

8

Pub Type

Journals

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Keywords

atomic force microscopy, bimetallic thermal sensor, ferromagnetic resonance, magnetic moments, thermal absorption, thin-film samples

Citation

Moreland, J. , Loehndorf, M. , Kabos, P. and McMichael, R. (2000), Ferromagnetic Resonance Spectroscopy with a Micromechanical Calorimeter Sensor, Review of Scientific Instruments, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=9776 (Accessed October 18, 2025)