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Browsing by Author "Pelekhov, D. V."

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    Detection of Higher Order Modulation Harmonics in Magnetic Resonance Force Microscopy
    (2007) Mewes, T.; Mewes, C. K. A.; Nazaretski, E.; Kim, J.; Fong, K. C.; Obukhov, Y.; Pelekhov, D. V.; Wigen, P. E.; Hammel, P. C.; University of Alabama Tuscaloosa
    Magnetic resonance force microscopy measurements of the electron spin resonance of a thin film of 2,2-diphenyl-1-picrylhydrazyl were performed using a low doped silicon cantilever with a high coercivity SmCo particle glued to its end. The low doping level enables amplitude modulation of the microwave field with only small spurious driving of the cantilever. Besides amplitude modulation we use frequency modulation of the microwave field at integer fractions of the cantilever resonance frequency leading to derivative signals up to the fourth derivative of the amplitude modulation response signal. The influence of the modulation depth on the line shape of the first derivative response is also presented.
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    Ferromagnetic Resonance Force Microscopy on a Thin Permalloy Film
    (2007) Nazaretski, E.; Martin, I.; Movshovich, R.; Pelekhov, D. V.; Hammel, P. C.; Zalalutdinov, M.; Baldwin, J. W.; Houston, B.; Mewes, T.; University of Alabama Tuscaloosa
    Ferromagnetic resonance force microscopy (FMRFM) offers a means of performing local ferromagnetic resonance. The authors have studied the evolution of the FMRFM force spectra in a continuous 50 nm thick permalloy film as a function of probe-film distance and performed numerical simulations of the intensity of the FMRFM probe-film interaction force, accounting for the presence of the localized strongly nonuniform magnetic field of the FMRFM probe magnet. Excellent agreement between the experimental data and the simulation results provides insight into the mechanism of FMR mode excitation in a FMRFM experiment.
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    Ferromagnetic Resonance Force Microscopy Studies of Arrays of Micron Size Permalloy Dots
    (2007) Mewes, T.; Kim, J.; Pelekhov, D. V.; Kakazei, G. N.; Wigen, P. E.; Batra, S.; Hammel, P. C.; University of Alabama Tuscaloosa
    Ferromagnetic resonance force microscopy (FMRFM) offers a means of performing local ferromagnetic resonance. The authors have studied the evolution of the FMRFM force spectra in a continuous 50 nm thick permalloy film as a function of probe-film distance and performed numerical simulations of the intensity of the FMRFM probe-film interaction force, accounting for the presence of the localized strongly nonuniform magnetic field of the FMRFM probe magnet. Excellent agreement between the experimental data and the simulation results provides insight into the mechanism of FMR mode excitation in a FMRFM experiment.
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    Temperature-dependent Magnetic Resonance Force Microscopy Studies of a Thin Permalloy Film
    Nazaretski, E.; Thompson, J. D.; Movshovich, R.; Zalalutdinov, M.; Baldwin, J. W.; Houston, B.; Mewes, T.; Pelekhov, D. V.; Wigen, P.; Hammel, P. C.; University of Alabama Tuscaloosa
    We used magnetic resonance force microscopy (MRFM) to study a 50 nm thick continuous Permalloy film. We mechanically measured the ferromagnetic resonance signal in the temperature range between 10 and 70 K in the presence of a static magnetic field applied normal to the surface of the film. The measurements show a decrease of the ferromagnetic resonance field with increasing temperature. We attribute this behavior to the temperature-dependent changes of the saturation magnetization. Our experiments demonstrate the potential of MRFM to perform quantitative ferromagnetic resonance measurements as a function of temperature.