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  • 1995-1999  (6)
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  • 1
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We describe the principles of dissipation measurements, discuss various eddy current damping mechanisms, give a brief review of a model for magnetoelastic dissipation due to domain-wall width oscillations, and present some applications of magnetic dissipation force microscopy to magnetic materials. Energy dissipation is measured by simultaneous monitoring of the damping of an oscillating cantilever and the shift in resonant frequency in a magnetic force microscope. Magnetoelastic dissipation is caused by tip-field-induced domain-wall width oscillations through magnetostriction effects. Magnetoelastic damping is strongly correlated with micromagnetic structures and allows different domain walls (such as Bloch and Néel walls) to be distinguished. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 279-281 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A method of measuring magnetic dissipation on a sub-100 nm scale is presented. This technique relies on measuring changes in the damping of the oscillating tip in a magnetic force microscope (MFM). Damping contrast is strongly correlated with micromagnetic structure and in the case of NiFe, is in quantitative agreement with magnetoelastic losses in the sample. On recording tracks, large damping signals are observed. This has direct consequences on the interpretation of traditional MFM images acquired with detectors that convolute frequency and damping information. © 1997 American Institute of Physics.
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 5922-5926 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This article presents a general treatment of magnetic dissipation due to domain wall width oscillation via magnetostriction in magnetic samples. The domain wall width is modeled as a harmonic oscillator. The parameters governing this oscillator (effective mass, stiffness, damping coefficient and driving force) are derived and expressed in terms of intrinsic magnetic parameters of magnetic materials. The magnetostriction induced damping of wall width oscillations is frictional in nature. An external ac magnetic field serves as a driving force of the oscillator. It is found that the response to the driving force depends very much on the micromagnetic structures of the magnetic domain wall. Different micromagnetic structures lead to different magnetic dissipation for a given external field. Besides giving a quantitative microscopic explanation to magnetic dissipation data measured by magnetic dissipation force microscopy, this theory predicts two new phenomena: one is that there is a minimum driving force for the wall width to oscillate and the other is a new resonance phenomenon, domain wall width resonance. © 1998 American Institute of Physics.
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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5024-5024 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the first direct measurement of local magnetic dissipation by magnetic force microscopy (MFM). A variation in dissipation of less than 10−17 W can be observed. This allows the determination of the strength of pinning sites and the variation in domain wall dampening on a sub-100 nm scale. We use a standard thin film coated Si3N4 MFM force sensor vibrated exactly at resonance. When close to the sample, the magnetic tip exerts a highly localized alternating magnetic field. Magnetic energy dissipation in the sample leads to dampening of the cantilever oscillation. The frequency, phase, and amplitude of the cantilever oscillation is measured with a dedicated phase-lock-loop circuit. The change in driving signal amplitude is directly proportional to the energy dissipation if the drive signal phase is constant. Constant force gradient and dissipation images are acquired simultaneously. By changing the tip–sample spacing, the magnitude of the tip magnetic field influencing the sample can systematically be varied. We demonstrate the potential of this technique by imaging local variations of dissipation in 4 nm thin sputtered Co films with Hc=178 Oe and in 30 nm Permalloy samples with Hc=2 Oe. In both cases a variation on a sub-100 nm scale with strong correlations between the simultaneously measured domain structure and the dissipation images is observed. As expected, dissipation is strongly dependent on the magnitude of the tip field. We also observe that the magnitude of the dissipation depends strongly on the sign of the magnetic interaction. The dissipation observed at Néel walls with attractive tip–sample interaction is larger than the dissipation at repulsive walls. © 1997 American Institute of Physics.
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  • 5
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 3598-3600 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic anisotropies can be modified locally by intense electron beams with keV energy. In ultrathin epitaxial Co films grown on Pt(111), switching of the easy axis from parallel to perpendicular to the surface can be induced, and the domain size can be enlarged by one order of magnitude. © 1998 American Institute of Physics.
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  • 6
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 1418-1420 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A model is presented for magnetic dissipation imaging and magnetic force gradient imaging obtained with a vibrating ferromagnetic tip and a ferromagnetic thin film sample. Results of calculations are compared to recent experiments and show good agreement using known bulk values for the magnetic parameters of tip and sample. We suggest that oscillations of domain wall width result in magnetoelastic emission of phonons. These phonons carry energy from the tip, leading to image contrast at domain walls. We also discuss the energy dissipation resulting from eddy current losses in the tip and sample. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
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