Controllable Broadband Absorption in the Mixed Phase of Metamagnets |
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| Authors: | Matej Pregelj Oksana Zaharko Andrej Zorko Matjaž Gomilšek Oles Sendetskyi Axel Günther Mykhaylo Ozerov Sergei A. Zvyagin Hubertus Luetkens Christopher Baines Vladimir Tsurkan Alois Loidl |
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| Affiliation: | 1. Jo?ef Stefan Institute, Ljubljana, Slovenia;2. Laboratory for Neutron Scattering and Laboratory for Micro‐ und Nanotechnology and Laboratory for Muon‐Spin Spectroscopy, Paul Scherrer Institut, Villigen, Switzerland;3. Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, Augsburg, Germany;4. Dresden High Magnetic Field Laboratory (HLD), Helmholtz‐Zentrum Dresden‐Rossendorf, Dresden, Germany;5. Institute of Applied Physics, Academy of Sciences of Moldova, Chisinau, Republic of Moldova |
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| Abstract: | Materials with broad absorption bands are highly desirable for electromagnetic filtering and processing applications, especially if the absorption can be externally controlled. Here, a new class of broadband‐absorption materials is introduced. Namely, layered metamagnets exhibit an electromagnetic excitation continuum in the magnetic‐field‐induced mixed ferro‐ and antiferromagnetic phase. Employing a series of complementary experimental techniques involving neutron scattering, muon spin relaxation, specific heat, ac and dc magnetization measurements, and electron magnetic resonance, a detailed magnetic phase diagram of Cu3Bi(SeO3)2O2Br is determined and it is found that the excitations in the mixed phase extend over at least ten decades of frequency. The results, which reveal a new dynamical aspect of the mixed phase in metamagnets, open up a novel approach to controllable microwave filtering. |
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| Keywords: | broadband absorption metamagnets microwave filtering |
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