Time resolved Kerr microscopy: Magnetization dynamics in thin film write heads

Back, Christian; Heidmann, J.; McCord, Jeffrey

doi:10.1109/20.750620

Cited by 32 publications

(8 citation statements)

References 11 publications

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“…This method is now well established and widely used for investigations in magnetic thin films and recording heads. [12][13][14][15][16][17] Other experiments using scanning Kerr microscopy focus onto the eigenmodes of the magnetization in magnetic elements 18 and the gyrotropic motion of a central vortex in magnetic thin film elements. 19 In addition to the magneto-optical methods other time-resolved imaging techniques, namely, time-resolved x-ray photoemission electron microscopy ͑XPEEM͒ and magnetic transmission x-ray microscopy ͑MTXM͒ demonstrated great potential [20][21][22][23][24][25] and were used for similar studies.…”

Section: Introductionmentioning

confidence: 99%

Small-amplitude magnetization dynamics in permalloy elements investigated by time-resolved wide-field Kerr microscopy

et al. 2005

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A wide-field polarization microscope, optimized for Kerr microscopy was extended with a mode-locked pulsed laser illumination source to investigate time-dependent magnetization processes with picosecond resolution, thus providing the possibility to directly compare the quasistatic with the dynamic magnetization response. Square-shaped Ni 81 Fe 19 elements were excited by fast magnetic field pulses aligned along and diagonally to the elements, respectively. Starting from the Landau ground state, the magnetic response to the excitation is dominated by a fast rotation of magnetization followed by slow relaxation, mostly through domain wall motion, back into the Landau state. Spike domains in the corners of the element form during the fast rotational process. Low angle domains with oscillatory behavior develop in the low dynamic permeability closure domains. Slow motion of the center vortex over several nanoseconds is recorded. The direct comparison of the dynamic and the static domain patterns is necessary for a understanding of all details of the magnetization processes.

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Section: Introductionmentioning

confidence: 99%

Small-amplitude magnetization dynamics in permalloy elements investigated by time-resolved wide-field Kerr microscopy

et al. 2005

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“…We have used ultra fast time-resolved scanning Kerr microscopy [7] with a time resolution of 5 ps and a spatial resolution of 300 nm to characterize the magnetization reversal in the SUL subjected to the write field. To evaluate the magneto-dynamic characteristics under device conditions either the SUL or the full medium stack including the SUL were directly deposited on the ABS of a pole head using a nonmagnetic spacer layer to emulate flying height ( Fig.…”

Section: Methodsmentioning

confidence: 99%

Experimental study of the head/medium magneto dynamics in perpendicular recording

Heidmann

Xiao

et al. 2005

Journal of Magnetism and Magnetic Materials

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“…Heidmann et al also use time-resolved magnetic microscopy in characterizing thin film magnetic recording devices [72]. As well as measuring the time-resolved flux response (polar mode) at the gap in different geometries, Fig.…”

Section: Magnetic Device Characterization and Nonrepetitive Processesmentioning

confidence: 99%

Stroboscopic Microscopy of Magnetic Dynamics

Freeman

Hiebert

Topics in Applied Physics

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Abstract. The enhanced capabilities of contemporary pulsed light sources have led to the reflourishing, in recent years, of ultrafast imaging of micromagnetic dynamics. Concurrently, interest in the subject has been intensified by other factors, such as the emergence of intrinsic magnetic response times as a potential limitation to the ultimate bandwidth of magnetic data storage and by increasingly powerful computer models of magnetic dynamics which call for experimental comparisons. This review contains a discussion of the experimental details behind ultrafast timeresolved magneto-optic imaging, sandwiched between a brief historical overview and a presentation of some recent results, and accompanied by an outline of some future prospects. Historical OverviewThe ongoing development of ultrafast laser technologies has made stroboscopic imaging of fast dynamics in microscopic structures very convenient. The stroboscopic, or "pump-probe" method as it is traditionally named by the optics community, has been grafted onto many different varieties of microscopy, including electron beam, scanning probe (force and tunneling), and, of course, optical (both conventional and near-field) [1,2,3,4]. Some applications of ultrafast optical microscopy are more fully developed than ultrafast scanning probe microscopies, many of which are still not too far beyond the "proof-of-principle" stage. This is largely because the development time for an ultrafast optical microscope is much shorter than that for combinations of ultrafast lasers with other imaging methods.Magnetic structures in particular have provided a major test bed for developments in ultrafast optical microscopy. The magneto-optic activity of ferromagnetic materials ideally suits them for this kind of experimental analysis. With characteristic relaxation times and oscillation periods ranging into the low picosecond range, and with domain wall widths and spin-wave wavelengths in the nanometer range, spatiotemporal investigation of these materials poses a difficult challenge for any type of microscopy. Ferroelectrics are another class with similar characteristics [5].As is often the case, the territory we explore now and find so fertile turns out to have been well surveyed by our predecessors, using the best tools of

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Time resolved Kerr microscopy: Magnetization dynamics in thin film write heads

Cited by 32 publications

References 11 publications

Small-amplitude magnetization dynamics in permalloy elements investigated by time-resolved wide-field Kerr microscopy

Small-amplitude magnetization dynamics in permalloy elements investigated by time-resolved wide-field Kerr microscopy

Experimental study of the head/medium magneto dynamics in perpendicular recording

Stroboscopic Microscopy of Magnetic Dynamics

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