Monday, April 20, 2009, 10:00 am — Large Conference Room, Building 703
Magnetic resonance force microscopy (MRFM) offers a very high sensitivity approach to detection of magnetic resonance. Proposed by J.A. Sidles in 1991 [1], it has been used for the detection of both electron spin resonance and nuclear magnetic resonance. Recently, Rugar and co-workers reported detection of a force signal originating from a single electron spin [2], emphatically demonstrating unprecedented MRFM sensitivity. Incorporating basic elements of Magnetic Resonance Imaging (MRI), MRFM can provide much higher spatial resolution than conventional MRI. Recently, ferromagnetic resonance (FMR) has been detected by MRFM [3-6]. In general, ferromagnetically coupled systems pose a challenge for spatially resolved FMR due to a strong exchange interaction between the spins. The observed resonance modes involve precession of spins in an entire sample. In our work we argue that the micromagnetic probe locally stabilizes magnetostatic modes detected in FMR thus indicating the potential for scanned probe imaging of magnetic properties in extended ferromagnetic films. We report MRFM spectra from various ferromagnetic samples and demonstrate the capability of MRFM to perform highly localized spectroscopic studies in ferromagnets. We discuss the model which accounts for the presence of a non-uniform tip field and compare numerical simulations to experimental data.
Hosted by: Qun Shen
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