| Author(s): |
John M. Moreland; M. Loehndorf; Pavel Kabos; Robert D. McMichael; |
| Title: |
Ferromagnetic Resonance Spectroscopy with a Micromechanical Calorimeter Sensor |
| Published: |
August 01, 2000 |
| 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 M3ff 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 10u-16^ Am2 (1X10-12emu) 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 |
| Pages: |
pp. 3099 - 3103 |
| Keywords: |
atomic force microscopy;bimetallic thermal sensor;ferromagnetic resonance;magnetic moments;thermal absorption;thin-film samples; |
| Research Areas: |
Electromagnetics |
| PDF version: |
 Click here to retrieve PDF version of paper (138KB) |
