Spin-induced polarizations and nonreciprocal directional dichroism of the room-temperature multiferroicBiFeO3
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Tartalom: http://dx.doi.org/10.1103/PhysRevB.92.094422
Archívum: MTA Könyvtár
Gyűjtemény: Status = Published

Type = Article
Cím:
Spin-induced polarizations and nonreciprocal directional dichroism of the room-temperature multiferroicBiFeO3
Létrehozó:
Fishman, Randy S.
Lee, Jun Hee
Bordács, Sándor
Kézsmárki, István
Nagel, Urmas
Rőőm, Toomas
Dátum:
2015
Téma:
QC06 Physics of condensed matter / szilárdtestfizika
Tartalmi leírás:
A microscopic model for the room-temperature multiferroic BiFeO3 that includes two Dzyaloshinskii-
Moriya interactions and single-ion anisotropy along the ferroelectric polarization predicts both the zero-field
spectroscopic modes as well as their splitting and evolution in a magnetic field. Due to simultaneously broken
time-reversal and spatial-inversion symmetries, the absorption of light changes as the magnetic field or the
direction of light propagation is reversed. We discuss three physical mechanisms that may contribute to this
absorption asymmetry known as nonreciprocal directional dichroism: the spin current, magnetostriction, and
single-ion anisotropy. We conclude that the nonreciprocal directional dichroism in BiFeO3 is dominated by
the spin-current polarization and is insensitive to the magnetostriction and easy-axis anisotropy. With three
independent spin-current parameters, our model accurately describes the nonreciprocal directional dichroism
observed for magnetic field along [1,?1,0]. Since some modes are almost transparent to light traveling in one
direction but opaque for light traveling in the opposite direction, BiFeO3 behaves as a room-temperature optical
diode at certain frequencies in the gigahertz to terahertz range. Our work demonstrates that an analysis of the nonreciprocal directional dichroism spectra based on an effective spin model supplemented by first-principles calculations can produce a quantitative microscopic theory of the magnetoelectric couplings in multiferroic
materials.
Típus:
Article
NonPeerReviewed
Formátum:
text
Azonosító:
Fishman, Randy S. and Lee, Jun Hee and Bordács, Sándor and Kézsmárki, István and Nagel, Urmas and Rőőm, Toomas (2015) Spin-induced polarizations and nonreciprocal directional dichroism of the room-temperature multiferroicBiFeO3. Physical Review B, 92 (9). ISSN 1098-0121
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