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  • 1
    Electronic Resource
    Electronic Resource
    Nanometer-scale imaging with an ultrafast scanning tunneling microscope (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 504-506 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present experimental data demonstrating the spatial resolution of an ultrafast junction mixing scanning tunneling microscope (JM-STM). The experiment uses a patterned metal-on-metal (Ti/Au) surface to establish electronic structure contrast on a short length scale. Our measurements achieve a spatio-temporal resolution of 20 nm–20 ps, limited only by the sample properties. The fine spatial resolution proves that the time-resolved signal is generated in the tunnel junction, indicating that atomic resolution should be possible in the JM-STM mode of operation. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120798
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  • 2
    Electronic Resource
    Electronic Resource
    Picosecond time-resolved magnetization dynamics of thin-film heads : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5898-5900 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The application of picosecond magneto-optic sampling techniques to studies of the magnetization dynamics of thin-film recording heads is described. Time-resolved magnetization measurements are performed using picosecond stroboscopic scanning Kerr microscopy. A Faraday probe is used to monitor the coil excitation current with the same optical setup, yielding a direct measure of the magnetic propagation delay through the head. This delay is found to have a marked spatial dependence across the face of the pole tips. As an aid to visualization of the spatial dependence, scanned images of the polar Kerr rotation at fixed time delays are acquired. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361896
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  • 3
    Electronic Resource
    Electronic Resource
    Time-resolved scanning Kerr microscopy of ferromagnetic structures (invited) : The 7th joint MMM-intermag conference on magnetism and magnetic materials (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 6217-6222 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Time-resolved microscopy enables valuable new measurements of the dynamics of resonance and relaxation in a range of magnetic systems. An overview of the scope of applications to ferromagnetic microstructures is presented. These include observations of ferromagnetic resonance and spatially nonuniform modes of oscillation, studies of magnetization reversal, and characterizations of the speed of magnetic recording devices. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367716
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  • 4
    Electronic Resource
    Electronic Resource
    Picosecond pulsed-field probes of magnetic systems (invited) : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6194-6198 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Time-resolved methods using picosecond scale transient magnetic fields have been developed for investigations of ultrafast magnetic phenomena in a broad variety of systems. When combined with synchronous magneto-optic detection, the approach yields stroboscopic observations of magnetic dynamics with a time resolution of order 1 ps, and a corresponding spatial resolution down to the diffraction limit of optics. Results are presented from experiments on europium chalcogenide films at low temperatures. A continuum of behavior from paramagnetic relaxation to ferromagnetic resonance is observed. Electron-beam deposited EuS films are found to have surprisingly fast spin-lattice relaxation rates, of order (100 ps)−1, and the influence of spin-orbit interactions on the spin dynamics is studied through rare-earth alloying. Results are presented from experiments utilizing the magneto-optic sampling method for direct time-resolved screening measurements of normal and superconducting metal films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355454
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  • 5
    Electronic Resource
    Electronic Resource
    Time-resolved scanning probe microscopy: Investigations and applications of dynamic magnetostriction (invited) : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6205-6210 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have measured the magnetostrictive response of small nickel and Tb0.3Dy0.7Fe1.95 cylinders to sudden step changes in applied magnetic field with a time-resolved scanning fiber interferometer. Spatially resolved measurements reveal the nonuniform distortion of the face of the rod as the induced magnetization propagates in toward the center. A crossover is observed, as a function of decreasing cylinder diameter, from eddy current- to longitudinal phonon-limited response times. The ability to characterize dynamic magnetostriction in small samples has also enabled us to perform time-resolved measurements of fast transient signals with a scanning tunneling microscope. Modulation of the tip-sample separation on short time scales is provided by the use of a nickel magnetostrictive tip driven by a local magnetic field coil. The technique offers a broadly applicable means of obtaining fast dynamical information in tunneling microscopy, and is demonstrated here on nanosecond time scales. These experiments illustrate, in the context of magnetics, the general promise of time-resolved scanning probe methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355456
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  • 6
    Electronic Resource
    Electronic Resource
    Femtosecond probes of magnetic phenomena: Spin-polarization spectroscopy in dilute-magnetic-semiconductor quantum wells (invited) (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5102-5107 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The spin-scattering times of charge carriers in dilute-magnetic-semiconductor multiple quantum-well structures are observed directly in a time-resolved experiment. Luminescence measurements with a temporal resolution of 150 fs, obtained via the sum-frequency-generation optical gating technique, monitor the evolution of carrier populations optically prepared to have nonequilibrium spin polarizations. This method enables measurements of spin scattering on shorter time scales than have hitherto been accessible. Spin-relaxation times of a few picoseconds are measured for quantum-confined electrons, and these times are found to be surprisingly insensitive to the presence of magnetic ions in the wells. The strong carrier-ion spin-spin–exchange mechanism is therefore not the dominant spin-scattering channel in these structures, contrary to theoretical expectations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344684
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  • 7
    Electronic Resource
    Electronic Resource
    Runaway electrons as a diagnostic of magnetic fluctuations (invited) : Proceedings of the 9th topical conference on high temperature plasma diagnostics (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 4595-4598 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The transport of runaway electrons in a hot plasma can be comparatively easily measured by perturbation experiments which provide a runaway electron diffusivity D. The diffusion can be interpreted in terms of a magnetic fluctuation level, from which an electron thermal diffusivity can be deduced. We find the runaway electron diffusion coefficient is determined by intrinsic magnetic fluctuations rather than electrostatic fluctuations because of the high energies involved. The results presented here demonstrate the efficacy of using runaway transport techniques for determining intrinsic magnetic fluctuations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143680
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  • 8
    Electronic Resource
    Electronic Resource
    A stroboscopic scanning solid immersion lens microscope (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 4468-4477 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A high resolution scanning optical microscope for stroboscopic time-resolved studies is presented. High optical efficiency is the prime motivation in selecting a solid immersion lens to surpass conventional diffraction limited resolution. A microscope design including details concerning the fabrication, mounting, and operation of both the hemispherical and the truncated-sphere solid immersion lenses is discussed. A thin-film magnetic recording head is used as a convenient, planar test specimen with well-defined optically reflective and magnetic features on a submicrometer length scale that allows characterization of the lateral spatial resolution of the instrument. In addition, the versatility of the microscope is demonstrated through examples of time-resolved magneto-optic imaging of the head. Further enhancement of the spatial resolution through the incorporation of confocal imaging is also described. The tradeoffs governing the selection of a particular style of microscope for specific circumstances are outlined. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148416
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  • 9
    Electronic Resource
    Electronic Resource
    Ultrafast microscopy and numerical simulation study of magnetization reversal dynamics in permalloy (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6830-6832 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have measured and simulated dynamics of magnetization reversal in a micrometer scale Ni80Fe20 polycrystalline thin film element in the time domain. The sample is probed experimentally using time-resolved scanning Kerr microscopy. This allows for spatially resolved images of the dynamical magnetization states. We have simulated these magnetic reversals micromagnetically for the case of an ideal rectangular element. The reversal rates agree semiqualitatively, and gross spatial features such as a stripe instability in the directions perpendicular to the applied field are reproduced. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372856
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  • 10
    Electronic Resource
    Electronic Resource
    Picosecond time-resolved magnetization reversal dynamics in Ni80Fe20 microstructure (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 7171-7173 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ultrafast magnetization reversal dynamics in a 15-nm-thick Ni80Fe20 microstructure (10 μm×2 μm) is studied using both time-resolved scanning Kerr microscopy and numerical simulation. The time dependence of the magnetization component along the magnetic easy axis reveals a dramatic reduction in switching time, when the magnetization vector is pulsed by a longitudinal switching field while a steady transverse biasing field is applied. According to the time domain images, the abrupt change of the switching time is due to the change in the magnetization reversal mode; i.e., the nucleation dominant reversal process is replaced by domain wall motion if a transverse biasing field is applied. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1358819
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