Polaritons in ferromagnets with linear magneto-electric properties

Barnaś, J.

doi:10.1088/0022-3719/19/3/010

Cited by 9 publications

(8 citation statements)

References 6 publications

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“…The dips on these plots are instead associated with bulk polariton modes [35]. By way of comment, we note that in work by Barnas for thin film multiferroics, bulk modes can be non-reciprocal for certain propagation directions [34,37].…”

Section: Trnasverse Electric (Te) Polarisationmentioning

confidence: 84%

“…where δ is the magnetoelectric coupling constant, K is a uniaxial anisotropy, λ is the Heisenberg exchange, and P y is a spontaneous electric polarisation in the material aligned along the y direction [35]. An example material for which this form of canting is applicable is BaMnF 4 [34,37,38]. It should be mention that this angle is often quite small, in BaMnF 4 , for instance, this is only 0.17 • .…”

Section: Polaritons In Antiferromagentic Multiferroicsmentioning

confidence: 99%

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Electromagnetic Waves in Canted Magnets

Macêdo¹,

Stamps²

2020

Compendium on Electromagnetic Analysis

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The optical properties of canted antiferromagnetics is discussed from the perspective of magnetic polaritons and field tunable electromagnetic properties. Canted antiferromagnets have a weak magnetization and their electromagnetic properties can be affected by applied magnetic and in the case of multiferroics, applied electric fields. A theoretical approach is outlined here that is useful for describing the THz frequency electromagnetic response and properties of a large variety of canted spin systems. The properties of two example systems are discussed: an antiferromagnet with canted induced through an externally applied magnetic field, and an antiferromagnetic multiferroic wherein the magnetic sublattices are canted by an internal coupling to a spontaneous dielectric polarisation.

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Section: Trnasverse Electric (Te) Polarisationmentioning

confidence: 84%

Section: Polaritons In Antiferromagentic Multiferroicsmentioning

confidence: 99%

Electromagnetic Waves in Canted Magnets

Macêdo¹,

Stamps²

2020

Compendium on Electromagnetic Analysis

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“…Interesting polaritons to study are those generated on multiferroic materials. In these materials, the magnetic and electric responses are coupled through magnetoelectric interactions [15][16][17][18][19][20]. The bulk modes in magnetoelectric coupled media have been discussed theoretically [15,16].…”

Section: Introductionmentioning

confidence: 99%

Mixed modes of surface polaritons in a PML-type magnetoelectric multiferroic with canted spins

Gunawan

Stamps

2012

J. Phys.: Condens. Matter

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We present a theoretical discussion of surface polaritons on a ferroelectric-antiferromagnet with magnetoelectric coupling which allows the magnetic subsystem to be canted. Canting of the antiferromagnet results in weak ferromagnetism. The surface polaritons for a semi-infinite film are calculated for a propagation parallel to the uniaxial easy axis, leading to mixed modes. A superposition of two plane waves is needed to generate mixed surface modes. We find two branches, one near the magnon resonance frequency and the other near the phonon resonance frequency. We also find that the surface modes are non-reciprocal due to magnetoelectric interaction, such that ω(k) ≠ ω(-k), where ω is the frequency and k is the propagation vector.

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“…Theoretical treatments for ferromagnetic polaritons 2,8 and simple antiferromagnets 1,9,10 were made several years ago. A most interesting class of polaritons are in multiferroic materials where magnetoelectric interactions couple magnetic and electric responses 4,11,12 . A focus of theoretical work has been on bulk modes in linear magnetoelectric coupled media 4,11 .…”

Section: Introductionmentioning

confidence: 99%

Surface and bulk polaritons in a PML-type magnetoelectric multiferroic with canted spins: TE and TM polarization

Gunawan

Stamps

2011

J. Phys.: Condens. Matter

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We present a theory for surface polaritons on ferroelectric-antiferromagnetic materials with canted spin structure. A small uniform canted moment is allowed, resulting in a weak ferromagnetism directed in the plane parallel to the surface. Surface and bulk polariton modes for a semi-infinite film are calculated for the case of transverse electric (TE) and transverse magnetic (TM) polarization. Example results are presented using parameters appropriate for BaMnF(4). We find that the surface modes are non-reciprocal for the TE polarization due to the magnetoelectric interaction, and the non-reciprocity can be controlled by an applied electric field. Example results for attenuated total reflection (ATR) are calculated. The magnetoelectric interaction also gives rise to 'leaky' surface modes in the case of TM polarization. These are pseudo-surface waves that exist in the pass band, and dissipate energy into the bulk of the material. We show that these pseudo-surface mode frequencies and properties can be modified by temperature and the application of external electric or magnetic fields.

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Polaritons in ferromagnets with linear magneto-electric properties

Cited by 9 publications

References 6 publications

Electromagnetic Waves in Canted Magnets

Electromagnetic Waves in Canted Magnets

Mixed modes of surface polaritons in a PML-type magnetoelectric multiferroic with canted spins

Surface and bulk polaritons in a PML-type magnetoelectric multiferroic with canted spins: TE and TM polarization

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