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Benchtop time-resolved magneto-optical Kerr magnetometer.

Anjan Barman¹, T Kimura, Y Otani

¹Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India. abarman@physics.iitd.ac.in

The Review of Scientific Instruments

|January 7, 2009

Summary

This study introduces a compact, affordable time-resolved Kerr magnetometer using a picosecond laser for measuring magnetization dynamics in magnetic materials. The system enables detailed analysis of magnetic thin films and patterned elements with high stability and ease of use.

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Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Understanding magnetization dynamics in magnetic thin films and nanostructures is crucial for developing advanced magnetic devices.
Traditional time-resolved Kerr microscopy often relies on expensive femtosecond laser systems, limiting accessibility.

Purpose of the Study:

To construct and demonstrate a compact, cost-effective benchtop time-resolved Kerr magnetometer.
To enable precise measurement of magnetization precession dynamics in magnetic thin films and patterned elements.

Main Methods:

Utilized a picosecond pulsed injection diode laser synchronized with electronic pulses for triggering magnetization precession.
Employed a microstrip line to deliver electronic pulses to the sample.
Measured magneto-optical Kerr rotation using polarized optical pulses synchronous with electronic triggers.
Integrated the system into a conventional upright microscope for imaging and probing.

Main Results:

Successfully measured time-resolved magnetization dynamics in Permalloy microwires and microdots.
Observed magnetic dynamics occurring across two distinct time scales.
Demonstrated the system's high stability, ease of alignment, and sample manipulation capabilities.

Conclusions:

The developed compact time-resolved Kerr magnetometer offers a viable and accessible alternative to expensive systems for studying ultrafast magnetic phenomena.
The system provides valuable insights into the dynamic behavior of magnetic nanostructures.
This technology can advance research in magnetic data storage and spintronics.