A method for the magneto-optic imaging of magnetization time evolution in thin films

Kasiraj, P.; Horne, D. E.; Best, J. S.

doi:10.1109/tmag.1987.1065632

Cited by 17 publications

(4 citation statements)

References 13 publications

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“…The authors go on [73] to investigate nonlinear transition shifts in high-frequency magnetic heads caused by transient flux effects associated with high data rates (as opposed to nonlinear effects caused by areal density). Previous optical time-resolved recording head work also includes [74,75,76,77,78].…”

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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Section: Magnetic Device Characterization and Nonrepetitive Processesmentioning

confidence: 99%

Stroboscopic Microscopy of Magnetic Dynamics

Freeman

Hiebert

Topics in Applied Physics

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“…Some of them use wide illumination in traditional microscope imaging schemes with television cameras as image detectors [1][2][3][4][5] while the others implement singlechannel photodetectors and focused light beams coupled with various types of scanning techniques to render images. [6][7][8][9][10][11][12][13][14] In recent years various combinations of these two approaches have become popular ͑Ref. 15, and references herein͒.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, signal-to-noise ratio is of a primary importance for practice. Traditionally, either the homodyne bichannel scheme was being used to investigate the Kerr effect 7,8,[18][19][20] or the method of direct detection of weak orthogonally polarized component. 1,13,[21][22][23] Recently a new technique based on heterodyning of cross-polarized components of Zeeman laser was introduced.…”

Section: Introductionmentioning

confidence: 99%

Scanning heterodyne Kerr-effect microscope for imaging of magnetic tracks

Protopopov

Lee

Kwon

et al. 2006

Review of Scientific Instruments

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Design and performance of a new type of Kerr microscope based on heterodyne cross-polarized technique is presented. Weak depolarization of the probe beam due to longitudinal magneto-optical Kerr effect is detected by means of heterodyne mixing of the two cross-polarized and frequency shifted waves generated by Zeeman-type He–Ne laser. In comparison with the traditional homodyne method the proposed technique has better sensitivity and spatial resolution. Experimental results of imaging service magnetic tracks on real samples of magnetic disks are presented, showing better contrast and spatial resolution with respect to the images obtained from commercial devices available in the market.

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“…The dynamics of magnetization response in thin film head yokes has been investigated using magneto-optic imaging techniques [6,7,8]. However, head fringing fields at high frequencies have not been reported previously.…”

Section: Introductionmentioning

confidence: 99%

Dynamic field distributions of thin film inductive heads

et al. 1992

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Dynamic recording fields of thin film inductive disk drive heads and their relationships to drive current, pole thickness and pole materials have been investigated. Electron beam tomography was used to directly observe the recording fields. With permalloy heads, improved frequency responses were achieved by exciting the magnetic core with higher drive currents. However, increases in the pole thickness significantly degraded the frequency responses. The amorphous CoTaZr head showed superior frequency response, and constant field intensity was maintained up to 30 MHz, regardless of drive current.

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A method for the magneto-optic imaging of magnetization time evolution in thin films

Cited by 17 publications

References 13 publications

Stroboscopic Microscopy of Magnetic Dynamics

Stroboscopic Microscopy of Magnetic Dynamics

Scanning heterodyne Kerr-effect microscope for imaging of magnetic tracks

Dynamic field distributions of thin film inductive heads

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