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|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|
|Pages:||pp. 7086 - 7090|
|Keywords:||calorimeter,cantilever,ferromagnetic resonance,field sensor,magnetic microscopy,microwave fields,torque|
|PDF version:||Click here to retrieve PDF version of paper (330KB)|