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Magnetic force microscopy and broadband spin wave spectroscopy on skyrmion-hosting FeGd thin films

Catapano, Edoardo

Magnetic force microscopy and broadband spin wave spectroscopy on skyrmion-hosting FeGd thin films.

Rel. Candido Pirri. Politecnico di Torino, Corso di laurea magistrale in Nanotechnologies For Icts (Nanotecnologie Per Le Ict), 2018

Abstract:

Magnetic skyrmions are complex spin textures with non-trivial topology whose characteristics can be exploited in storage technology. In systems with perpendicular magnetic anisotropy, such as Fe/Gd multilayer films, they can be stabilized, under out-of-plane magnetic fields, by the competition between dipolar and exchange interaction. The magnetic force microscope has been used to explore the magnetic configurations of Fe/Gd amorphous multilayer samples. The MFM revealed the presence of skyrmion lattices in [Fe(0.34nm)/Gd(0.5nm)]x80 for 78-85 mT. In [Fe(0.34nm)/Gd(0.41nm)]x80, instead, stripe domains pass directly to a single domain without collapsing in skyrmion bubbles. The magnetization dynamics of [Fe(0.34nm)/Gd(0.5nm)]x80 have been investigated with all electrical spectroscopy in the GHz regime , with a focus on the resonant behaviour of skyrmions.

Relatori: Candido Pirri
Anno accademico: 2018/19
Tipo di pubblicazione: Elettronica
Informazioni aggiuntive: Tesi secretata. Full text non presente
Soggetti:
Corso di laurea: Corso di laurea magistrale in Nanotechnologies For Icts (Nanotecnologie Per Le Ict)
Classe di laurea: Nuovo ordinamento > Laurea magistrale > LM-29 - INGEGNERIA ELETTRONICA
Ente in cotutela: Ecole Polytechnique Fédérale de Lausanne (SVIZZERA)
Aziende collaboratrici: NON SPECIFICATO
URI: http://webthesis.biblio.polito.it/id/eprint/8982
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