Abstract:
:Linear dichroism - the polarization dependent absorption of electromagnetic waves- is routinely exploited in applications as diverse as structure determination of DNA or polarization filters in optical technologies. Here filamentary absorbers with a large length-to-width ratio are a prerequisite. For magnetization dynamics in the few GHz frequency regime strictly linear dichroism was not observed for more than eight decades. Here, we show that the bulk chiral magnet Cu2OSeO3 exhibits linearly polarized magnetization dynamics at an unexpectedly small frequency of about 2 GHz at zero magnetic field. Unlike optical filters that are assembled from filamentary absorbers, the magnet is shown to provide linear polarization as a bulk material for an extremely wide range of length-to-width ratios. In addition, the polarization plane of a given mode can be switched by 90° via a small variation in width. Our findings shed a new light on magnetization dynamics in that ferrimagnetic ordering combined with antisymmetric exchange interaction offers strictly linear polarization and cross-polarized modes for a broad spectrum of sample shapes at zero field. The discovery allows for novel design rules and optimization of microwave-to-magnon transduction in emerging microwave technologies.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Stasinopoulos I,Weichselbaumer S,Bauer A,Waizner J,Berger H,Garst M,Pfleiderer C,Grundler Ddoi
10.1038/s41598-017-07020-2subject
Has Abstractpub_date
2017-08-01 00:00:00pages
7037issue
1issn
2045-2322pii
10.1038/s41598-017-07020-2journal_volume
7pub_type
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