Abstract
Femtosecond laser-induced magnetization dynamics is a popular research topic, due to its potential applications in fast magnetic storage devices and the field of spintronics. In the article we present a novel technique for time-resolved measurement of femtosecond laser-induced magnetization dynamics, based on inductive sensing by a loop antenna. It allows performing investigation of magnetization dynamics in highly absorbing samples, samples with patterned surfaces and samples coated by a thin metallic layer, which are difficult to study using optical techniques. To test the technique, both thick and thin films made of highly absorbing and diffusing materials, were used. Results of tests for several ferromagnetic materials including Gadolinium are discussed in the article. The test results prove that the method provides a simple tool to observe and study magnetization dynamics phenomena in the vicinity of the materials’ Curie temperature.
Highlights
Since the discovery of ultra-fast magnetization processes under femtosecond laser excitation, various magnetic materials in forms of thin films, microstructures and nanostructures have been studied with regard to the fast laser or current-induced magnetization dynamics.1–3 Numerous techniques, such as time-resolved X-ray magnetic circular dichroism (TR-XMCD),4 time-resolved magnetooptical Kerr effect (TR-MOKE),5 or pulsed inductive microwave magnetometry (PIMM)6 were developed to study ultra-fast magnetization dynamics in thin films.While optical measurement techniques such as MOKE are fast and more common, than inductive measurement techniques such as PIMM, they are difficult to use for study of absorbing, patterned scitation.org/journal/adv surface or metallic layer coated samples
In the article we present a novel technique for time-resolved measurement of femtosecond laser-induced magnetization dynamics, based on inductive sensing by a loop antenna
It allows performing investigation of magnetization dynamics in highly absorbing samples, samples with patterned surfaces and samples coated by a thin metallic layer, which are difficult to study using optical techniques
Summary
Since the discovery of ultra-fast magnetization processes under femtosecond laser excitation, various magnetic materials in forms of thin films, microstructures and nanostructures have been studied with regard to the fast laser or current-induced magnetization dynamics.1–3 Numerous techniques, such as time-resolved X-ray magnetic circular dichroism (TR-XMCD),4 time-resolved magnetooptical Kerr effect (TR-MOKE),5 or pulsed inductive microwave magnetometry (PIMM)6 were developed to study ultra-fast magnetization dynamics in thin films.While optical measurement techniques such as MOKE are fast and more common, than inductive measurement techniques such as PIMM, they are difficult to use for study of absorbing, patterned scitation.org/journal/adv surface or metallic layer coated samples. In the article we present a novel technique for time-resolved measurement of femtosecond laser-induced magnetization dynamics, based on inductive sensing by a loop antenna.
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