Magnetostatics and dynamics of ion irradiated NiFe, Ta multilayer films studied by vector network analyzer ferromagnetic resonance [Elektronische Ressource] / von Daniel Markó

Magnetostatics and Dynamics of IonIrradiated NiFe/Ta Multilayer FilmsStudied by Vector Network AnalyzerFerromagnetic ResonanceD I S S E R T A T I O Nzur Erlangung des akademischen GradesDoctor rerum naturalium(Dr. rer. nat.)vorgelegtder Fakultat Mathematik und Naturwissenschaftender Technischen Universitat DresdenvonDipl.-Phys. Daniel Mark ogeboren am 12.12.1981 in SebnitzEingereicht am 17.08.2010Die Dissertation wurde in der Zeit von 12/2006 bis 06/2010 im Institutfur Ionenstrahlphysik und Materialforschung am ForschungszentrumDresden-Rossendorf e.V. angefertigt.1. Gutachter: Prof. Dr. J. Fa bender, Forschungszentrum Dresden-Rossendorf e.V.2. Gutachter: Prof. Dr. J. Wosnitza, Forschungszentrum e.V.Datum der Verteidigung: 25.11.2010AbstractIn the present work, the implications of ion irradiation on the magnetostatic anddynamic properties of soft magnetic Py/Ta (Py = Permalloy: Ni Fe ) single and80 20multilayer lms have been investigated with the main objective of nding a way todetermine their saturation magnetization. Both polar magneto-optical Kerr e ect(MOKE) and vector network analyzer ferromagnetic resonance (VNA-FMR) mea-surements have proven to be suitable methods to determine M , circumventing0 Sthe problem of the unknown e ective magnetic volume that causes conventional tech-niques such as SQUID or VSM to fail.