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Ultrafast magnetization dynamics describe the physics of a magnetic system on the perturbation by a strong laser pulse. This pulse excites the electrons close to the Fermi energy. It is followed by a thermaliza- tion due to a variety of scattering processes. The plenitude of these processes is of fundamental interest for solid states physics, but is not yet understood properly. In the field of ultrafast magnetization dynamics most progress was achieved by all optical measurements. However, the interpretation of all optical experiments is still under de- bate. In order to gain direct insight into the time evolution of the spin 8 2 polarization a time and spin-resolved pump-probe experiment is ap- d plied. This allows one to measure the quenching of the spin polariza- n tion without any optical contributions. In our experiment the spin po- a B larization of the photoexcited electrons of in situ prepared thin Fe and - Co films is measured directly with a Mott-detector. The overall signal k shape matches the one of the all optical measurements. Thus, with si y the help of our measurements it could thus be shown, that the all h optical techniques indeed contain a contribution of magnetic origin. P e h i e r s n o ti Alexander Weber a t r Ultrafast Spindynamics in e s s Ferromagnetic Thin Films i D a 28 hr e c rb ae KW s er e n d n n a a ISBN 978-3-86845-089-7 ISBN 978-3-86845-089-7 h x oe Jl A 9 783868450897 Alexander Weber Ultrafast Spindynamics in Ferromagnetic Thin Films Ultrafast Spindynamics in Ferromagnetic Thin Films Dissertation zur Erlangung des Doktorgrades der Naturwissenschaften (Dr. rer. nat.) der F akultät für Physik der Universität Regensburg vorgelegt von Alexander Weber aus Regensburg 2010 Die Arbeit wurde von Prof. Dr. C. H. Back angeleitet. Das Promotionsgesuch wurde am 30.06.2010 eingereicht. Prüfungsausschuss: Vorsitzender: Prof. Dr. V. Braun 1. Gutachter: Prof. Dr. C. H. Back 2. Gutachter: Prof. Dr. J. Repp weiterer Prüfer: Prof. Dr. C. Strunk Dissertationsreihe der Fakultät für Physik der Universität Regensburg, Band 28 Herausgegeben vom Präsidium des Alumnivereins der Physikalischen Fakultät: Klaus Richter, Andreas Schäfer, Werner Wegscheider, Dieter Weiss Alexander Weber Ultrafast Spindynamics in Ferromagnetic Thin Films Bibliografische Informationen der Deutschen Bibliothek. Die Deutsche Bibliothek verzeichnet diese Publikation in der Deutschen Nationalbibliografie. Detailierte bibliografische Daten sind im Internet über http://dnb.ddb.de abrufbar. 1. Auflage 2012 © 2012 Universitätsverlag, Regensburg Leibnizstraße 13, 93055 Regensburg Konzeption: Thomas Geiger Umschlagentwurf: Franz Stadler, Designcooperative Nittenau eG Layout: Alexander We ber Druck: Docupoint, Magdeburg ISBN: 978-3-86845-089-7 Alle Rechte vorbehalten. Ohne ausdrückliche Genehmigung des Verlags ist es nicht gestattet, dieses Buch oder Teile daraus auf fototechnischem oder elektronischem Weg zu vervielfältigen. Weitere Informationen zum Verlagsprogramm erhalten Sie unter: www.univerlag-regensburg.de – – – A – A – A l – A l e – A l e x –Ale –Alex –Alexa –Alexa –Alexan –Alexand–Alexand Alexande Alexander lexander lexanderWexanderW xanderW anderWe x a n d e r W e b a n nd d e er r W W e eb b e n d e r W e b e r d eUlertrafarst SWpindWynamicsein eb b e er r – e r W e b e r – rWeber–AleWeber–AFlexerWeberr–Aolexamebear–Alexganeeber–AtlexaniceberT–Alexandhinber–AlexandFilerm–Alexandes er–Alexanderr–Alexander–AlexanderW–AlexanderWAlexanderWAlexanderWe x a n d e r W e b a n nd d e er r W W e eb b e n d e r W e b e r d e r W e b e r e r W e b e r – e r W e b e r – rWeber–AleWeber–AlexWeber–Alexaeber–Alexaeber–Alexaneber–Alexandber–Alexander–Alexandeer–Alexanderr–Alexander–AlexanderW–AlexanderWAlexanderWAlexanderWe xa an ndDissnedrtatioden er er rW W W e eb eb be n d e r W e b e r d e r W e b e r e r W e b e r – zur Erlanguneg des Droktorgrades deWr Naturwissenschaften (eDr. rer.bnat.) e r – 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..........r.We.be.r–.Al.e....W.eb.er.–A.le.x....W.ebe.r–.A.lexa.....e.ber.–.Ale.xa... eber–Alexaneber–Alexandber–Alexander–Alexandeer–Alexanderr–Alexander–AlexanderW–AlexanderWAlexanderWAlexanderWe x a n d e r W e b a n d e r W e b n d e r W e b e n d e r W e b e r Promotionsgesucdh eingereeicht am:er30.0r6.2010 W W e eb b e er r – e r W e b e r – TDParieu¨gfAudnerbrgesmaituu¨wsnsduclhriduchesrWseeab:nern–AgPleerlu¨efituWenebtegr–v:Aleoxn: Weber–AlexPPPP1Pa7rrrrr.ooooo0fffff1.....e.b2eDDDDDr–0Arrrrrl1e.....xa2VCJCC.....RHHSBebeterr..r–paAuBBlpeuxnaaannkcckk eber((((–APV21lex..aorndu¨rGGsfeiuutrttz)baaeercc–nAhhldexttaneeedrrr))) er–Alexandeer–Alexanderr–Alexander–AlexanderW–AlexanderWAlexanderWAlexanderWe x a n d e r W e b a n d e r W e b n d e r W e b e n d e r W e b e r d e r W e b e r e r W e b e r – e r W e b e r – r W e b e r – W e b e r – W e b e r – e b e r – e b e r – e b e r – b e r – e r – e r – r – – – – – – A – A – A l – A l e –Ale –Alex –Alexa –Alexa –Alexan –Alexand–Alexand–Alexande AlexanderAlexander lexanderWlexanderWexanderWxanderWe x a n d e r W e b a n d e r W e b n d e r W e b e n d e r W e b e r d e r W e b e r e r W e b e r – e r W e b e r – rWeber–AleWeber–AlexWeber–Alexaeber–Alexaeber–Alexaneber–Alexandber–Alexander–Alexandeer–Alexanderr–Alexander–AlexanderW–AlexanderWAlexanderWAlexanderWe x a n d e r W e b a n d e r W e b n d e r W e b e n d e r W e b e r d e r W e b e r e r W e b e r – e r W e b e r – rWeber–AleWeber–AlexWeber–Alexaeber–Alexaeber–Alexaneber–Alexandber–Alexander–Alexandeer–Alexanderr–Alexander–AlexanderW–AlexanderWAlexanderWAlexanderWe x a n d e r W e b a n d e r W e b n d e r W e b e nd d ”eDie Natuerr verstehrt gar keiWnen SpaWß, e eb b e er r e r W e b e r – e r sie ist immWer wahr, immer ernst, ime- b e r – rWeber–AleWeber–AlexmddieWeeserbeFrM–seAltehexranleensrcghueeenb;ernd–sA.ile”Ixearrhtau¨tmebeirem–ArlemxasnienrdRiebm–eer–cAmGlhexatneodreutdnhideeber–Alexander–Alexandeer–Alexanderr–Alexander–AlexanderW–AlexanderWAlexanderWAlexanderWe x a n d e r W e b a n d e r W e b n d e r W e b e n d e r W e b e r d e r W e b e r e r W e b e r – e r W e b e r – r W e b e r – W e b e r – W e b e r – e b e r – e b e r – e b e r – b e r – e r – e r – r – – – – – – A – A – A l – A l e –Ale –Alex –Alexa –Alexa –Alexan –Alexand–Alexand–Alexande AlexanderAlexander lexanderWlexanderWexanderWxanderWe x a n d e r W e b a n d e r W e b n d e r W e b e n d e r W e b e r d e r W e b e r e r W e b e r – e r W e b e r – rWeber–AleWeber–AlexWeber–Alexaeber–Alexaeber–Alexaneber–Alexandber–Alexander–Alexandeer–Alexanderr–Alexander–AlexanderW–AlexanderWAlexanderWAlexanderWe x a n d e r W e b a n d e r W e b n d e r W e b e n d e r W e b e r d e r W e b e r e r W e b e r – e r W e b e r – 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vii

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Preview Ultrafast Spindynamics in Ferromagnetic Thin Films Alexander Weber

Ultrafast magnetization dynamics describe the physics of a magnetic system on the perturbation by a strong laser pulse. This pulse excites the electrons close to the Fermi energy. It is followed by a thermaliza- tion due to a variety of scattering processes. The plenitude of these processes is of fundamental interest for solid states physics, but is not yet understood properly. In the field of ultrafast magnetization dynamics most progress was achieved by all optical measurements. However, the interpretation of all optical experiments is still under de- bate. In order to gain direct insight into the time evolution of the spin 8 2 polarization a time and spin-resolved pump-probe experiment is ap- d plied. This allows one to measure the quenching of the spin polariza- n tion without any optical contributions. In our experiment the spin po- a B larization of the photoexcited electrons of in situ prepared thin Fe and - Co films is measured directly with a Mott-detector. The overall signal k shape matches the one of the all optical measurements. Thus, with si y the help of our measurements it could thus be shown, that the all h optical techniques indeed contain a contribution of magnetic origin. P e h i e r s n o ti Alexander Weber a t r Ultrafast Spindynamics in e s s Ferromagnetic Thin Films i D a 28 hr e c rb ae KW s er e n d n n a a ISBN 978-3-86845-089-7 ISBN 978-3-86845-089-7 h x oe Jl A 9 783868450897 Alexander Weber Ultrafast Spindynamics in Ferromagnetic Thin Films Ultrafast Spindynamics in Ferromagnetic Thin Films Dissertation zur Erlangung des Doktorgrades der Naturwissenschaften (Dr. rer. nat.) der F akultät für Physik der Universität Regensburg vorgelegt von Alexander Weber aus Regensburg 2010 Die Arbeit wurde von Prof. Dr. C. H. Back angeleitet. Das Promotionsgesuch wurde am 30.06.2010 eingereicht. Prüfungsausschuss: Vorsitzender: Prof. Dr. V. Braun 1. Gutachter: Prof. Dr. C. H. Back 2. Gutachter: Prof. Dr. J. Repp weiterer Prüfer: Prof. Dr. C. Strunk Dissertationsreihe der Fakultät für Physik der Universität Regensburg, Band 28 Herausgegeben vom Präsidium des Alumnivereins der Physikalischen Fakultät: Klaus Richter, Andreas Schäfer, Werner Wegscheider, Dieter Weiss Alexander Weber Ultrafast Spindynamics in Ferromagnetic Thin Films Bibliografische Informationen der Deutschen Bibliothek. Die Deutsche Bibliothek verzeichnet diese Publikation in der Deutschen Nationalbibliografie. Detailierte bibliografische Daten sind im Internet über http://dnb.ddb.de abrufbar. 1. Auflage 2012 © 2012 Universitätsverlag, Regensburg Leibnizstraße 13, 93055 Regensburg Konzeption: Thomas Geiger Umschlagentwurf: Franz Stadler, Designcooperative Nittenau eG Layout: Alexander We ber Druck: Docupoint, Magdeburg ISBN: 978-3-86845-089-7 Alle Rechte vorbehalten. Ohne ausdrückliche Genehmigung des Verlags ist es nicht gestattet, dieses Buch oder Teile daraus auf fototechnischem oder elektronischem Weg zu vervielfältigen. Weitere Informationen zum Verlagsprogramm erhalten Sie unter: www.univerlag-regensburg.de – – – A – A – A l – A l e – A l e x –Ale –Alex –Alexa –Alexa –Alexan –Alexand–Alexand Alexande Alexander lexander lexanderWexanderW xanderW anderWe x a n d e r W e b a n nd d e er r W W e eb b e n d e r W e b e r d eUlertrafarst SWpindWynamicsein eb b e er r – e r W e b e r – rWeber–AleWeber–AFlexerWeberr–Aolexamebear–Alexganeeber–AtlexaniceberT–Alexandhinber–AlexandFilerm–Alexandes er–Alexanderr–Alexander–AlexanderW–AlexanderWAlexanderWAlexanderWe x a n d e r W e b a n nd d e er r W W e eb b e n d e r W e b e r d e r W e b e r e r W e b e r – e r W e b e r – rWeber–AleWeber–AlexWeber–Alexaeber–Alexaeber–Alexaneber–Alexandber–Alexander–Alexandeer–Alexanderr–Alexander–AlexanderW–AlexanderWAlexanderWAlexanderWe xa an ndDissnedrtatioden er er rW W W e eb eb be n d e r W e b e r d e r W e b e r e r W e b e r – zur Erlanguneg des Droktorgrades deWr Naturwissenschaften (eDr. rer.bnat.) e r – rdWebeer–rAleNatuWebrerw–AdlexiesArseUlneWensbexrci–vAhalvexeaaonrrfsgtdieltile¨caeebeghtrr–teAlRexnvaWoenFgeeankebbersu–ebAlletxuarn¨artgIIeber-–AlePxandhysibker–Alexander–Alexandeer–Alexanderr–Alexander–AlexanderW–AlexanderWAlexanderWAlexanderWe x a n d e r W e b a n ausndRegensbdurg e er r W W e eb b e n d e r W e b e r d e r W e b e r e r W e b e r – e r W e b e r – r W2010 e b e r – W e b e r – W e b e r – e b e r – e b e r – e b e r – b e r – e r – e r – r – – – – – – A – A – A l – A l e –Ale –Alex –Alexa –Alexa –Alexan –Alexand–Alexand–Alexande AlexanderAlexander lexanderWlexanderWexanderWxanderWe x a n d e r W e b a n d e r W e b n d e r W e b e n d e r W e b e r d e r W e b e r e r W e b e r – e r W e b e r – rWeber–AleWeber–AlexWeber–Alexaeber–Alexaeber–Alexaneber–Alexandber–Alexander–Alexandeer–Alexanderr–Alexander–AlexanderW–AlexanderWAlexanderWAlexanderWe x a n d e r W e b a n d e r W e b n d e r W e b e n d e r W e b e r d e r W e b e r e r W e b e r – e r W e b e r – 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–Alexand–Alexand–Alexande AlexanderAlexander lexanderWlexanderWexanderWxanderWe x a n d e r W e b a n d e r W e b n d e r W e b e n d e r W e b e r d e r W e b e r e r W e b e r – e r W e b e r – rWeber–AleWeber–AlexWeber–Alexaeber–Alexaeber–Alexaneber–Alexandber–Alexander–Alexandeer–Alexanderr–Alexander–AlexanderW–AlexanderWAlexanderWAlexanderWe x a n d e r W e b a n d e r W e b n d e r W e b e n d e r W e b e r d e r W e b e r e r W e b e r – e r W e b e r – rWeber–AleWeber–AlexWeber–Alexaeber–Alexaeber–Alexaneber–Alexandber–Alexander–Alexandeer–Alexanderr–Alexander–AlexanderW–AlexanderWAlexanderWAlexanderWe x a n d e r W e b a n d e r W e b n d e r W e b e nd d ”eDie Natuerr verstehrt gar keiWnen SpaWß, e eb b e er r e r W e b e r – e r sie ist immWer wahr, immer ernst, ime- b e r – rWeber–AleWeber–AlexmddieWeeserbeFrM–seAltehexranleensrcghueeenb;ernd–sA.ile”Ixearrhtau¨tmebeirem–ArlemxasnienrdRiebm–eer–cAmGlhexatneodreutdnhideeber–Alexander–Alexandeer–Alexanderr–Alexander–AlexanderW–AlexanderWAlexanderWAlexanderWe x a n d e r W e b a n d e r W e b n d e r W e b e n d e r W e b e r d e r W e b e r e r W e b e r – e r W e b e r – r W e b e r – W e b e r – W e b e r – e b e r – e b e r – e b e r – b e r – e r – e r – r – – – – – – A – A – A l – A l e –Ale –Alex –Alexa –Alexa –Alexan –Alexand–Alexand–Alexande AlexanderAlexander lexanderWlexanderWexanderWxanderWe x a n d e r W e b a n d e r W e b n d e r W e b e n d e r W e b e r d e r W e b e r e r W e b e r – e r W e b e r – rWeber–AleWeber–AlexWeber–Alexaeber–Alexaeber–Alexaneber–Alexandber–Alexander–Alexandeer–Alexanderr–Alexander–AlexanderW–AlexanderWAlexanderWAlexanderWe x a n d e r W e b a n d e r W e b n d e r W e b e n d e r W e b e r d e r W e b e r e r W e b e r – e r W e b e r – 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vii

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Ultrafast magnetization dynamics describe the physics of a magnetic system on Layout: Alexander Weber .. Theory behind the Experimental Techniques. 13.
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