Cantilever detected ferromagnetic resonance in thin Fe50Ni50, Co2FeAl0.5Si0.5 and Sr2FeMoO6 films using a double modulation technique

Alexey Alfonsov; Eiji Ohmichi; Pavel Leksin; Ahmad Omar; Hailong Wang; Sabine Wurmehl; Fengyuan Yang; Hitoshi Ohta

doi:10.1016/j.jmr.2016.07.011

Cantilever detected ferromagnetic resonance in thin Fe50Ni50, Co2FeAl0.5Si0.5 and Sr2FeMoO6 films using a double modulation technique

J Magn Reson. 2016 Sep:270:183-186. doi: 10.1016/j.jmr.2016.07.011. Epub 2016 Jul 25.

Authors

Alexey Alfonsov¹, Eiji Ohmichi², Pavel Leksin³, Ahmad Omar³, Hailong Wang⁴, Sabine Wurmehl⁵, Fengyuan Yang⁴, Hitoshi Ohta⁶

Affiliations

¹ Molecular Photoscience Research Center, Kobe University, Kobe 657-8501, Japan. Electronic address: a.alfonsov@ifw-dresden.de.
² Graduate School of Science, Kobe University, 1-1 Rokkodai-cho, Nada, Kobe 657-8501, Japan.
³ Leibniz Institute for Solid State and Materials Research Dresden, IFW, D-01171 Dresden, Germany.
⁴ Department of Physics, The Ohio State University, Columbus, OH 43210, USA.
⁵ Leibniz Institute for Solid State and Materials Research Dresden, IFW, D-01171 Dresden, Germany; Institut fur Festkörperphysik, Technische Universität Dresden, D-01062 Dresden, Germany.
⁶ Molecular Photoscience Research Center, Kobe University, Kobe 657-8501, Japan; Graduate School of Science, Kobe University, 1-1 Rokkodai-cho, Nada, Kobe 657-8501, Japan.

PMID: 27498338
DOI: 10.1016/j.jmr.2016.07.011

Abstract

In this work we introduce a new method, which employs commercial piezo-cantilevers, for a ferromagnetic resonance (FMR) detection from thin, nm-size, films. Our setup has an option to rotate the sample in the magnetic field and it operates up to the high microwave frequencies of 160GHz. Using our cantilever based FMR spectrometer we have investigated a set of samples, namely quasi-bulk and 84nm film Co2FeAl0.5Si0.5 samples, 16nm Fe50Ni50 film and 150nm Sr2FeMoO6 film. Low frequency and room temperature test of our setup using 84nm Co2FeAl0.5Si0.5 film yielded a result identical to a standard X-Band spectrometer, namely a single line with quite small linewidth. Our measurements at low temperatures and high frequencies revealed a quite strong FMR response detected in all samples. The FMR spectra share common features, such as the emergence of the second line with an opposite angular dependence, and a drastic increase of the linewidths with increasing microwave frequency. We believe that these findings are results of the complicated dynamics of the magnetization at low temperatures and high frequencies, which we were able to probe using our cantilever based FMR setup.

Keywords: Cantilever; FMR; Ferromagnetic resonance; Halfmetals.

Publication types

Research Support, Non-U.S. Gov't