Submicrometer resolution far field high sensitivity Kerr microscopy for in-plane magnetization detection

Wang, C. H.; Yang, Z.

doi:doi:10.1063/1.3183496

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Optical fiber-based single-shot picosecond transient absorption spectroscopy

A new type of single-shot transient absorption apparatus is described based on a bundle of optical fibers. The bundle contains 100 fibers of different lengths, each successively giving ∼ 15 ps longer optical delay. Data are collected by imaging light from the exit of the bundle into a sample where it is overlapped with an electron pulse or laser excitation pulse, followed by imaging onto a charge coupled device (CCD) detector where the intensity of light from each fiber is measured simultaneou...

A versatile ultrastable platform for optical multidimensional Fourier-transform spectroscopy

The JILA multidimensional optical nonlinear spectrometer (JILA-MONSTR) is a robust, ultrastable platform consisting of nested and folded Michelson interferometers that can be actively phase stabilized. This platform generates a square of identical laser pulses that can be adjusted to have arbitrary time delay between them while maintaining phase stability. The JILA-MONSTR provides output pulses for nonlinear excitation of materials and phase-stabilized reference pulses for heterodyne detection ...

We report that a far field magneto-optical system designed for detecting the off-plane magnetization in polar configuration can also detect the in-plane magnetization, while preserving the high sensitivity by using symmetric illumination and photoelastic modulation, even though the optical axis of the system is vertical to the sample surface. The spatial resolution can reach 500 nm at 514 nm in wavelength. The in-plane sensitivity can be eliminated by using an aperture to remove the off-axis obliquely incident light generated by the high numerical aperture objective lens that focuses the laser beam onto the sample surface.

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KEYWORDS and PACS

Keywords

electron spin polarisation, Kerr magneto-optical effect, laser beams, lenses, magnetic domains, magnetisation, photoelasticity

PACS

78.20.Ls

Magneto-optical effects
75.60.Ej

Magnetization curves, hysteresis, Barkhausen and related effects
78.20.hb

Piezo-optical, elasto-optical, acousto-optical, and photoelastic effects
42.60.Jf

Beam characteristics: profile, intensity, and power; spatial pattern formation
75.60.Ch

Domain walls and domain structure
72.25.-b

Spin polarized transport

ARTICLE DATA

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http://dx.doi.org/10.1063/1.3183496

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0034-6748 (print)

1089-7623 (online)

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American Institute of Physics

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