Magnetisation switching of FePt nanoparticle recording medium by femtosecond laser pulses

Abstract Manipulation of magnetisation with ultrashort laser pulses is promising for information storage device applications. The dynamics of the magnetisation response depends on the energy transfer from the photons to the spins during the initial laser excitation. A material of special interest fo...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	R. John, M. Berritta, D. Hinzke, C. Müller, T. Santos, H. Ulrichs, P. Nieves, J. Walowski, R. Mondal, O. Chubykalo-Fesenko, J. McCord, P. M. Oppeneer, U. Nowak, M. Münzenberg
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/c50f420ea02c4e1c8d342e7bdcb2a583
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:c50f420ea02c4e1c8d342e7bdcb2a583
record_format	dspace
spelling	oai:doaj.org-article:c50f420ea02c4e1c8d342e7bdcb2a5832021-12-02T15:05:38ZMagnetisation switching of FePt nanoparticle recording medium by femtosecond laser pulses10.1038/s41598-017-04167-w2045-2322https://doaj.org/article/c50f420ea02c4e1c8d342e7bdcb2a5832017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04167-whttps://doaj.org/toc/2045-2322Abstract Manipulation of magnetisation with ultrashort laser pulses is promising for information storage device applications. The dynamics of the magnetisation response depends on the energy transfer from the photons to the spins during the initial laser excitation. A material of special interest for magnetic storage are FePt nanoparticles, for which switching of the magnetisation with optical angular momentum was demonstrated recently. The mechanism remained unclear. Here we investigate experimentally and theoretically the all-optical switching of FePt nanoparticles. We show that the magnetisation switching is a stochastic process. We develop a complete multiscale model which allows us to optimize the number of laser shots needed to switch the magnetisation of high anisotropy FePt nanoparticles in our experiments. We conclude that only angular momentum induced optically by the inverse Faraday effect will provide switching with one single femtosecond laser pulse.R. JohnM. BerrittaD. HinzkeC. MüllerT. SantosH. UlrichsP. NievesJ. WalowskiR. MondalO. Chubykalo-FesenkoJ. McCordP. M. OppeneerU. NowakM. MünzenbergNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q R. John M. Berritta D. Hinzke C. Müller T. Santos H. Ulrichs P. Nieves J. Walowski R. Mondal O. Chubykalo-Fesenko J. McCord P. M. Oppeneer U. Nowak M. Münzenberg Magnetisation switching of FePt nanoparticle recording medium by femtosecond laser pulses
description	Abstract Manipulation of magnetisation with ultrashort laser pulses is promising for information storage device applications. The dynamics of the magnetisation response depends on the energy transfer from the photons to the spins during the initial laser excitation. A material of special interest for magnetic storage are FePt nanoparticles, for which switching of the magnetisation with optical angular momentum was demonstrated recently. The mechanism remained unclear. Here we investigate experimentally and theoretically the all-optical switching of FePt nanoparticles. We show that the magnetisation switching is a stochastic process. We develop a complete multiscale model which allows us to optimize the number of laser shots needed to switch the magnetisation of high anisotropy FePt nanoparticles in our experiments. We conclude that only angular momentum induced optically by the inverse Faraday effect will provide switching with one single femtosecond laser pulse.
format	article
author	R. John M. Berritta D. Hinzke C. Müller T. Santos H. Ulrichs P. Nieves J. Walowski R. Mondal O. Chubykalo-Fesenko J. McCord P. M. Oppeneer U. Nowak M. Münzenberg
author_facet	R. John M. Berritta D. Hinzke C. Müller T. Santos H. Ulrichs P. Nieves J. Walowski R. Mondal O. Chubykalo-Fesenko J. McCord P. M. Oppeneer U. Nowak M. Münzenberg
author_sort	R. John
title	Magnetisation switching of FePt nanoparticle recording medium by femtosecond laser pulses
title_short	Magnetisation switching of FePt nanoparticle recording medium by femtosecond laser pulses
title_full	Magnetisation switching of FePt nanoparticle recording medium by femtosecond laser pulses
title_fullStr	Magnetisation switching of FePt nanoparticle recording medium by femtosecond laser pulses
title_full_unstemmed	Magnetisation switching of FePt nanoparticle recording medium by femtosecond laser pulses
title_sort	magnetisation switching of fept nanoparticle recording medium by femtosecond laser pulses
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/c50f420ea02c4e1c8d342e7bdcb2a583
work_keys_str_mv	AT rjohn magnetisationswitchingoffeptnanoparticlerecordingmediumbyfemtosecondlaserpulses AT mberritta magnetisationswitchingoffeptnanoparticlerecordingmediumbyfemtosecondlaserpulses AT dhinzke magnetisationswitchingoffeptnanoparticlerecordingmediumbyfemtosecondlaserpulses AT cmuller magnetisationswitchingoffeptnanoparticlerecordingmediumbyfemtosecondlaserpulses AT tsantos magnetisationswitchingoffeptnanoparticlerecordingmediumbyfemtosecondlaserpulses AT hulrichs magnetisationswitchingoffeptnanoparticlerecordingmediumbyfemtosecondlaserpulses AT pnieves magnetisationswitchingoffeptnanoparticlerecordingmediumbyfemtosecondlaserpulses AT jwalowski magnetisationswitchingoffeptnanoparticlerecordingmediumbyfemtosecondlaserpulses AT rmondal magnetisationswitchingoffeptnanoparticlerecordingmediumbyfemtosecondlaserpulses AT ochubykalofesenko magnetisationswitchingoffeptnanoparticlerecordingmediumbyfemtosecondlaserpulses AT jmccord magnetisationswitchingoffeptnanoparticlerecordingmediumbyfemtosecondlaserpulses AT pmoppeneer magnetisationswitchingoffeptnanoparticlerecordingmediumbyfemtosecondlaserpulses AT unowak magnetisationswitchingoffeptnanoparticlerecordingmediumbyfemtosecondlaserpulses AT mmunzenberg magnetisationswitchingoffeptnanoparticlerecordingmediumbyfemtosecondlaserpulses
_version_	1718388792310628352

Magnetisation switching of FePt nanoparticle recording medium by femtosecond laser pulses

Ejemplares similares