The effects of linear and quadratic magneto-optical coupling in the one-magnon Raman spectrum of FeF<sub>2</sub>

Ariai, J.; Bates, Peter; Cottam, M. G.; Smith, Stephen R.

doi:10.1088/0022-3719/15/12/023

Cited by 10 publications

(9 citation statements)

References 11 publications

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“…Likewise from the experimental spectra in (ZZ), (YX) and (ZX) polarizations at 12 K we have estimated the relative magnitudes of the optical coupling coefficients B 2 , B 3 , and B 4 in Eq. (15). We find |B 4 /B 3 | = 0.8 and |B 2 /B 3 | = 0.3.…”

Section: Two-magnon Scatteringmentioning

confidence: 70%

“…(13) and (12), respectively, so a polarization analysis of the experimental data can be used to distinguish between their contributions. Analogous results for the anti-Stokes scattering intensity [4,14,15] can be written down in a similar fashion. An important conclusion is that the anti-Stokes to Stokes ratio of intensities, which is simply equal to n 0 /(n 0 + 1) or exp[-ω(0)/k B T] in many cases, is modified when both linear and quadratic magnetooptical terms contribute.…”

Section: Magnetooptical Coupling and Raman Intensitiesmentioning

confidence: 99%

“…(15). The results for MnF 2 are summarized in Table 4, where the values are quoted relative to the largest coefficient B 3 .…”

Section: Two-magnon Scatteringmentioning

confidence: 99%

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Magnetooptic coupling coefficients for one- and two-magnon Raman scattering in rutile-structure antiferromagnets FeF2, MnF2, CoF2, and NiF2

Lockwood

Cottam

2012

Low Temperature Physics

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Inelastic light scattering intensities of magnetic excitations are governed by the magnetooptic coupling coefficients, which have been evaluated, for example, for the ferrimagnet Y 3 Fe 5 O 12 (YIG) and the metamagnets FeCl 2 and FeBr 2 . However, by far the most detailed studies to date have been performed on the classic rutilestructure antiferromagnets, and we summarize here the results obtained from the many experimental and theoretical investigations in these compounds for both one-magnon and two-magnon excitations. A comparison of the magnitudes of the various coupling coefficients for MnF 2 , FeF 2 , CoF 2 , and NiF 2 reveals a surprising similarity in many coefficients. In one-magnon Raman scattering, the in-phase linear magnetooptic coefficient dominates and the main differences between MnF 2 , FeF 2 , and NiF 2 lie in the relative significance of the in-phase quadratic magnetooptic coefficient. Thus the quadratic coefficients are now seen to be of particular importance in determining the strength of the one-magnon scattering in a variety of magnetic insulators. In two-magnon Raman scattering, one magnetooptic coefficient dominates for all of these antiferromagnets. However, each of the other six coefficients are remarkably similar in magnitude, in general, and not negligible in most cases, indicating some universality in the way light interacts with the pairs of magnons of opposite and equal wave vector in rutile structure antiferromagnets.

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Section: Two-magnon Scatteringmentioning

confidence: 70%

Section: Magnetooptical Coupling and Raman Intensitiesmentioning

confidence: 99%

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Magnetooptic coupling coefficients for one- and two-magnon Raman scattering in rutile-structure antiferromagnets FeF2, MnF2, CoF2, and NiF2

Lockwood

Cottam

2012

Low Temperature Physics

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“…For our purposes, one-magnon processes coming from quadratic terms in the spin (e.g., ∝Ŝ zŜ± ) can be absorbed in the definition of K ± . This model applies, e.g., to the uniaxial AFMs MnF 2 or FeF 2 [60,61], and for the simple cubic AFM NiO for which K − = 0.…”

mentioning

confidence: 99%

Antiferromagnetic cavity optomagnonics

Parvini

Bittencourt

Kusminskiy

2020

Phys. Rev. Research

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Currently there is a growing interest in studying the coherent interaction between magnetic systems and electromagnetic radiation in a cavity, prompted partly by possible applications in hybrid quantum systems. We propose a multimode cavity optomagnonic system based on antiferromagnetic insulators, where optical photons couple coherently to the two homogeneous magnon modes of the antiferromagnet. These have frequencies typically in the THz range, a regime so far mostly unexplored in the realm of coherent interactions, and which makes antiferromagnets attractive for quantum transduction from THz to optical frequencies. We derive the theoretical model for the coupled system, and show that it presents unique characteristics. In particular, if the antiferromagnet presents hard-axis magnetic anisotropy, the optomagnonic coupling can be tuned by a magnetic field applied along the easy axis. This allows us to bring a selected magnon mode into and out of a dark mode, providing an alternative for a quantum memory protocol. The dynamical features of the driven system present unusual behavior due to optically induced magnon-magnon interactions, including regions of magnon heating for a red-detuned driving laser. The multimode character of the system is evident in a substructure of the optomagnonically induced transparency window.

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“…This model applies e.g. to the uniaxial AFMs MnF 2 or FeF 2 [51,52], and for the simple cubic AFM NiO for which K − = 0.…”

mentioning

confidence: 99%

Antiferromagnetic cavity optomagnonics

Parvini,

Bittencourt,

Kusminskiy

2019

Preprint

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We propose a cavity optomagnonic system based on antiferromagnetic insulators. We derive the Hamiltonian of the system and obtain the coupling of the antiferromagnetic magnon modes to the optical cavity field as a function of magnetic field and material properties. We show that, in the presence of hard-axis anisotropy, the optomagnonic coupling can be tuned by a magnetic field applied along the easy axis, allowing to bring a selected magnon mode into and out of a dark mode. For easy-axis antiferromagnets the coupling is instead independent of the magnetic field. We study the dynamic features of the driven system including optically induced magnon amplification and cooling, Purcell enhancement of transmission, and induced transparency, and discuss their experimental feasibility.

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The effects of linear and quadratic magneto-optical coupling in the one-magnon Raman spectrum of FeF₂

Cited by 10 publications

References 11 publications

Magnetooptic coupling coefficients for one- and two-magnon Raman scattering in rutile-structure antiferromagnets FeF2, MnF2, CoF2, and NiF2

Magnetooptic coupling coefficients for one- and two-magnon Raman scattering in rutile-structure antiferromagnets FeF2, MnF2, CoF2, and NiF2

Antiferromagnetic cavity optomagnonics

Antiferromagnetic cavity optomagnonics

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The effects of linear and quadratic magneto-optical coupling in the one-magnon Raman spectrum of FeF2

Cited by 10 publications

References 11 publications

Magnetooptic coupling coefficients for one- and two-magnon Raman scattering in rutile-structure antiferromagnets FeF2, MnF2, CoF2, and NiF2

Magnetooptic coupling coefficients for one- and two-magnon Raman scattering in rutile-structure antiferromagnets FeF2, MnF2, CoF2, and NiF2

Antiferromagnetic cavity optomagnonics

Antiferromagnetic cavity optomagnonics

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The effects of linear and quadratic magneto-optical coupling in the one-magnon Raman spectrum of FeF₂