Methods for wide-field Kerr imaging of small magnetic devices

Trouilloud, P. L.; Petek, B.; Argyle, B. E.

doi:10.1109/20.334119

Cited by 20 publications

(7 citation statements)

References 8 publications

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“…A wide-field Kerr microscope 10,11 was used to image the distribution of magnetization M in the thin films at room temperature. The polarized-light microscope was set to detect the changes in the polarization of light upon reflection from the magnetic surface due to the longitudinal Kerr effect.…”

Section: Methodsmentioning

confidence: 99%

Magnetic domain structures of La0.67Sr0.33MnO3 thin films with different morphologies

Lecoeur

Trouilloud

Xiao

et al. 1997

Journal of Applied Physics

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Using a wide-field Kerr microscope, we have studied the magnetic domain structures of epitaxial and polycrystalline La 0.67 Sr 0.33 MnO 3 thin films as well as a film having thermally induced ͗110͘ microcracks. The epitaxial film on a ͑001͒ SrTiO 3 substrate has different magnetic domain behaviors for in-plane fields applied along the ͗100͘ and ͗110͘ directions. Magnetic domain orientation and contrast suggest a biaxial magnetic anisotropy with ͗110͘ easy axes. Defects such as microcracks and grain boundaries have a strong perturbing effect on the local magnetization and can lead to an enhanced and controllable spin-dependent scattering.

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Section: Methodsmentioning

confidence: 99%

Magnetic domain structures of La0.67Sr0.33MnO3 thin films with different morphologies

Lecoeur

Trouilloud

Xiao

et al. 1997

Journal of Applied Physics

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“…For example, in wide-field Kerr imaging, a reference image of a magnetically saturated sample (containing no domain walls) is often subtracted from images acquired in other fields, to obtain a crisper representation of the domain configurations [47,48]. In rasterscanned time-resolved experiments, we have opted most frequently to modulate the magnetic excitation, subtracting the state in which no excitation is present from that with excitation.…”

Section: System Operationmentioning

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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“…One of the microscopy methods uses visible light. Since the polarization direction of the light is influenced by both direction and magnitude of the magnetization, a laser beam of optical Kerr effect devices can reveal the map of magnetic domains [123,124] by scanning the surface of the sample. However the resolution is limited by wavelength.…”

Section: Microscopy Techniquesmentioning

confidence: 99%

A Survey of Nanomagnetism

Aktaş

2002

Nanostructured Magnetic Materials and Their Applications

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Methods for wide-field Kerr imaging of small magnetic devices

Cited by 20 publications

References 8 publications

Magnetic domain structures of La0.67Sr0.33MnO3 thin films with different morphologies

Magnetic domain structures of La0.67Sr0.33MnO3 thin films with different morphologies

Stroboscopic Microscopy of Magnetic Dynamics

A Survey of Nanomagnetism

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