| Author(s): |
Albrecht Jander; John M. Moreland; Pavel Kabos; |
| Title: |
Micromechanical Detectors for Local Field Measurements Based on Ferromagnetic Resonance |
| Published: |
June 01, 2001 |
| Abstract: |
Ferromagnetic resonance (FMR) measurements were performed on micron-size thin-film samples integrated onto a micromechanical detector. The FMR response is coupled to cantilever motion in one of three ways. 1) Measure the change in torque on the sample in a uniform field. The FMR precession reduces the static magnetic moment of the sample with a resultant change in torque. 2) Measure the damping torque acting on the FMR precession. 3) Measure the energy absorbed in FMR using a bimaterial cantilever as calorimeter sensor. Our instrument is capable of measuring the FMR response in NiFe samples as small as 2x10-11 cm3 in ambient conditions with a signal-to-noise ratio of 100. In addition we have demonstrated that this system can be used as a quantitative scanning probe magnetic field microscope. Using the magnetic field sensitivity of the FMR response in a small ferromagnetic particle we have achieved 50 A/m field resolution on 20 mm length scales. Both dc fields and microwave fields were imaged. |
| Citation: |
Journal of Applied Physics |
| Volume: |
89 |
| Issue: |
11 |
| Pages: |
pp. 7086 - 7090 |
| Keywords: |
calorimeter;cantilever;ferromagnetic resonance;field sensor;magnetic microscopy;microwave fields;torque; |
| Research Areas: |
Electromagnetics |
| PDF version: |
 Click here to retrieve PDF version of paper (322KB) |
