Large directional optical anisotropy in multiferroic ferroborate

Kuzmenko, A. M.; Dziom, V.; Shuvaev, A.; Schiebl, M.; Mukhin, A. A.; Ivanov, V. Yu.; Гудим, И. А.; Безматерных, Л. Н.; Pimenov, Alexander

doi:10.1103/physrevb.92.184409

Cited by 22 publications

(17 citation statements)

References 43 publications

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“…While the trilinear form of the directional anisotropy has not been experimentally demonstrated in full extent in multiferroics, the effect was found to be highly amplified by the built-in symmetry breaking fields, in some cases leading to one-way transparency [11,20,22,23,29]. Parts of the trilinear expression were verified recently in various multiferroic or magnetoelectric crystals, by showing that δn changes sign upon the flipping of M [6-8, 11, 21, 22, 29, 42], k [23], M and/or P [12,14,15], M and/or k [20].…”

Section: Introductionmentioning

confidence: 99%

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Confirming the trilinear form of the optical magnetoelectric effect in the polar honeycomb antiferromagnet Co$_{2}$Mo$_3$O$_8$

Farkas¹,

Strinić²,

Ghara³

et al. 2021

Preprint

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Magnetoelectric phenomena are intimately linked to relativistic effects and also require the material to break spatial inversion symmetry and time reversal invariance. Magnetoelectric coupling can substantially affect light-matter interaction and lead to non-reciprocal light propagation. Here, we confirm on a fully experimental basis, without invoking either symmetry-based or material-specific assumptions, that the optical magnetoelectric effect in materials with non-parallel magnetization (M ) and electric polarization (P ) generates a trilinear term in the refractive index, δn ∝ k•(P ×M ), where k is the propagation vector of light. Its sharp magnetoelectric resonances, that are simultaneously electric and magnetic dipole active excitations, make Co2Mo3O8 an ideal compound to demonstrate this fundamental relation via independent variation of M , P and k. Remarkably, the material shows almost perfect one-way transparency in moderate magnetic fields at some of the magnetoelectric resonances.

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Section: Introductionmentioning

confidence: 99%

“…However, in some compounds the socalled one-way transparency, i.e. the maximal directional anisotropy, has been achieved in resonance with magnetoelectric excitations [17,20,22,23,29,32].…”

Section: Introductionmentioning

confidence: 99%

Confirming the trilinear form of the optical magnetoelectric effect in the polar honeycomb antiferromagnet Co$_{2}$Mo$_3$O$_8$

Farkas¹,

Strinić²,

Ghara³

et al. 2021

Preprint

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“…All prior observations of THz ODE in magnetoelectric multiferroics were in a magnetic state with long-range order, often at very low temperatures. [38][39][40][41] In FeZnMo 3 O 8 , the ODE remains strong in the high temperature paramagnetic state without magnetic order because it occurs at the frequency of the anisotropy gap excitation governed by the single-ion magnetic and magnetoelectric Hamiltonian. These interactions open up a promising avenue in the search for high-temperature (especially room-temperature) ODE in other paramagnetic crystals.…”

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confidence: 99%

Broken symmetries, non-reciprocity, and multiferroicity

et al. 2018

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The interplay of space and time symmetries, ferroic properties, chirality and notions of reciprocity determines many of the technologically important properties of materials such as optical diode effect, e.g., in polar ferromagnet FeZnMo 3 O 8 . We illustrate these concepts, including the non-reciprocal directional dichroism, through a number of practical examples. In particular, the conditions for non-reciprocity of ferro-rotational order are discussed and the possible use of linear optical gyration is suggested as a way to detect ferro-rotational domains. In addition, we provide the means to achieve high-temperature optical diode effect and elucidate multiferroic behaviors as a result of helical vs. cycloidal spins. Finally, we identify different entities behaving similarly under all symmetry operations, which are useful to understand non-reciprocity and multiferroicity in various materials intuitively.npj Quantum Materials (2018) 3:19 ; doi:10.1038/s41535-018-0092-5 When the motion of an object in one direction is different from that in the opposite direction, it is called a non-reciprocal effect. 1The object can be an electron, a phonon (lattice wave), a magnon (spin wave), or light in crystalline solids, and the best known example is that of non-reciprocal charge transport (i.e., diode) effects in p-n junctions, where a built-in electric field (E) breaks the directional symmetry. The polarization (P) of ferroelectrics can also act like the built-in electric field, so bulk ferroelectric diode (and photovoltaic) effects can be realized.2 Certainly, both E and P are polar vectors, and behave identically under various symmetry considerations. In addition to p-n junctions, numerous technological devices such as optical isolators, spin current diodes or metamaterials utilize non-reciprocal effects. In this perspective, we will discuss how non-reciprocal effects can arise from broken symmetries in various crystalline materials, especially multiferroics.Multiferroics are materials where ferroelectric and magnetic orders coexist, and space inversion and time reversal symmetries are simultaneously broken.3 Thus, multiferroics are often good candidates for non-reciprocal effects. Magnetic order naturally breaks time reversal symmetry, and a magnetic lattice, combined with a crystallographic lattice, can break space inversion symmetry, leading to multiferroicity, called magnetism-driven ferroelectricity. In this perspective, two types of magnetism-driven ferroelectricity will also be considered in terms of various symmetries.Symmetry governs physics, in particular a broken symmetry leads to a phase transition. (ref. 4 and references therein). There are five important symmetries relevant to crystalline materials, namely translational, rotational, mirror reflection, space inversion and time reversal. Note that these symmetries are not completely independent; for example, space inversion operation is equivalent to a 180°rotation about the vertical axis plus a mirror reflection about the horizontal mirror plane. Full th...

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“…Multiferroic iron borates present a rich collection of excitations in the terahertz range [62][63][64][65]. According the optical experiments [66,67], in the iron borates the splitting of the ground rare-earth doublets are close to the magnon frequencies of the magnetic Fe-subsystem.…”

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confidence: 99%

“…In case of SmFe 3 (BO 3 ) 4 other modes [62] may be also expected to reveal voltage sensitivity. For the low-frequency electromagnon [64,65] strong static magnetic field must be applied to raise the resonance frequency up to the millimeter frequency range. Magnetic field thus would align the Fe moments (see Fig.…”

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confidence: 99%

Switching of Magnons by Electric and Magnetic Fields in Multiferroic Borates

et al. 2018

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Electric manipulation of magnetic properties is a key problem of materials research. To fulfil the requirements of modern electronics, these processes must be shifted to high frequencies. In multiferroic materials this may be achieved by electric and magnetic control of their fundamental excitations. Here we identify magnetic vibrations in multiferroic iron-borates which are simultaneously sensitive to external electric and magnetic fields. Nearly 100 % modulation of the terahertz radiation in an external field is demonstrated for SmFe3(BO3)4. High sensitivity can be explained by a modification of the spin orientation which controls the excitation conditions in multiferroic borates. These experiments demonstrate the possibility to alter terahertz magnetic properties of materials independently by external electric and magnetic fields.

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Large directional optical anisotropy in multiferroic ferroborate

Cited by 22 publications

References 43 publications

Confirming the trilinear form of the optical magnetoelectric effect in the polar honeycomb antiferromagnet Co$_{2}$Mo$_3$O$_8$

Confirming the trilinear form of the optical magnetoelectric effect in the polar honeycomb antiferromagnet Co$_{2}$Mo$_3$O$_8$

Broken symmetries, non-reciprocity, and multiferroicity

Switching of Magnons by Electric and Magnetic Fields in Multiferroic Borates

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