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Controllable Broadband Absorption in the Mixed Phase of Metamagnets
Author(s) -
Pregelj Matej,
Zaharko Oksana,
Zorko Andrej,
Gomilšek Matjaž,
Sendetskyi Oles,
Günther Axel,
Ozerov Mykhaylo,
Zvyagin Sergei A.,
Luetkens Hubertus,
Baines Christopher,
Tsurkan Vladimir,
Loidl Alois
Publication year - 2015
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201500702
Subject(s) - materials science , absorption (acoustics) , microwave , condensed matter physics , phase (matter) , excitation , magnetization , ferromagnetism , phase diagram , magnetic field , physics , quantum mechanics , composite material
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 Cu 3 Bi(SeO 3 ) 2 O 2 Br 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.