Dresden 2011 – wissenschaftliches Programm
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KR: Fachgruppe Kristallographie
KR 5: Poster Multiferroics (Joint Session of MA, DF, DS, KR, TT)
KR 5.41: Poster
Dienstag, 15. März 2011, 10:45–13:00, P2
Ferromagnetic resonance in Heusler thin films using broadband microwave transmission spectroscopy — •Diana Geiger1, Marc Scheffler1, Martin Dressel1, and Martin Jourdan2 — 11. Physikalisches Institut, Universität Stuttgart, Germany — 2Institut für Physik, Johannes-Gutenberg-Universität Mainz, Germany
Heusler compounds with a chemical structure X2YZ are very promising candidates for applications in spintronics because some of them are ferromagnets with a perfect spin polarization of the electrons at the Fermi level. In order to utilize these qualities it is crucial to understand the magnetic properties of these materials. Co2Cr0.6Fe0.4Al (CCFA) is a ferromagnetic Heusler material with a Curie temperature of 700 to 800K, which makes it well suitable for magnetoelectronic devices. With ferromagnetic resonance studies, magnetization and magnetic moments of ferromagnets can be probed.
We performed broadband microwave stripline transmission measurements on CCFA Heusler samples in variable magnetic field of 0 to 160 mT at temperatures from 100K to 300K. The covered frequency range is 45 MHz to 12 GHz. We employ a stripline geometry where our CCFA thin film serves as ground plane, separated from a copper meandered inner conductor by teflon sheets. With this experimental approach we were able to detect and identify the ferromagnetic resonance in a broad frequency range. We will present both the field and temperature dependence of the ferromagnetic resonance.