Magneto-optics of nanoscale Bi:YIG films

Berzhansky, V. N.; Михайлова, Т. В.; Shaposhnikov, A. N.; Prokopov, A. R.; Karavainikov, A. V.; Котов, В. А.; Balabanov, D. E.; Бурков, В. И.

doi:10.1364/ao.52.006599

Cited by 29 publications

(13 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4,8,14,15,18,20,21 Faraday rotation enhancement through photon trapping in magnetophotonic crystal defects has also been investigated. [22][23][24][25] Prior work on dimensional effects in ultrathin magnetooptic garnets films has revealed changes in specific Faraday rotation.…”

mentioning

confidence: 99%

“…[22][23][24][25] Prior work on dimensional effects in ultrathin magnetooptic garnets films has revealed changes in specific Faraday rotation. 21 No clear-cut enhancement in gyrotropic response has been reported and the effect has been ascribed to a transition between ferrimagnetic phases. Sputter-deposited films of various thicknesses were used in those studies.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Large magneto-optic enhancement in ultra-thin liquid-phase-epitaxy iron garnet films

Levy

Chakravarty

Huang

et al. 2015

Applied Physics Letters

View full text Add to dashboard Cite

Articles you may be interested inPlasmon resonance enhancement of Faraday rotation of liquid phase epitaxy grown garnet films populated with gold nanoparticles on the film surfaces Growth effects (rotation rate) on the characteristics of bismuth substituted lutetium iron garnets Significant departures from bulk-like magneto-optic behavior are found in ultra-thin bismuth-substituted iron-garnet films grown by liquid-phase-epitaxy. These changes are due, at least in part, to geometrical factors and not to departures from bulk-composition in the transient layer at the filmsubstrate interface. A monotonic increase in specific Faraday rotation with reduced thickness is the signature feature of the observed phenomena. These are traced to size-dependent modifications in the diamagnetic transition processes responsible for the Faraday rotation. These processes correspond to the electronic transitions from singlet 6 S ground states to spin-orbit split excited states of the Fe 3þ ions in the garnet. A measurable reduction in the corresponding ferrimagnetic resonance linewidths is found, thus pointing to an increase in electronic relaxation times and longer lived excitations at reduced thicknesses. These changes together with a shift in vibrational frequency of the Bi-O bonds in the garnet at reduced thicknesses result in greatly enhanced magneto-optical performance. These studies were conducted on epitaxial monocrystalline Bi 0.8 Gd 0.2 Lu 2 Fe 5 O 12 films. V C 2015 AIP Publishing LLC. [http://dx.

show abstract

mentioning

confidence: 99%

mentioning

confidence: 99%

Large magneto-optic enhancement in ultra-thin liquid-phase-epitaxy iron garnet films

Levy

Chakravarty

Huang

et al. 2015

Applied Physics Letters

View full text Add to dashboard Cite

show abstract

“…In YIG Θ F > Θ C in the infrared [see Table I], so the coupling is reduced because |m φ | < |m ρ | [see Eqs. (36) and (37)]. The Bessel functions asymptotically become Airy's functions, Eq.…”

Section: Optomagnonic Couplingmentioning

confidence: 99%

“…Thus, the observed and predicted coupling rates were too low to be able to optically manipulate magnons [31,32]. Higher optomagnonic coupling can be achieved by reducing the size of the magnets down to optical wavelengths [35], but this requires nanostructuring of the magnet [36][37][38]. Coupling to magnons in a non-uniform magnetization texture is large [39].…”

mentioning

confidence: 99%

Optimal mode matching in cavity optomagnonics

et al. 2019

View full text Add to dashboard Cite

Inelastic scattering of photons is a promising technique to manipulate magnons but it suffers from weak intrinsic coupling. We theoretically discuss an idea to increase optomagnonic coupling in optical whispering gallery mode cavities, by generalizing previous analysis to include the exchange interaction. We predict that the optomagnonic coupling constant to surface magnons in yttrium iron garnet (YIG) spheres with radius 300 µm can be up to 40 times larger than that to the macrospin Kittel mode. Whereas this enhancement falls short of the requirements for magnon manipulation in YIG, nanostructuring and/or materials with larger magneto-optical constants can bridge this gap.Magnetic insulators such as yttrium iron garnet (YIG) are promising for future spintronic applications such as low power logic devices [1], long-range information transfer [2], and quantum information [3]. Their excellent magnetic quality [4,5] implies spin waves or magnons, the excitations of the magnetic order, are long-lived. Microwaves in high quality cavities and striplines couple strongly to magnons with long (mm) wavelengths [6][7][8][9][10][11][12], i.e. the rate of energy exchange between the two systems is higher than their individual dissipation rates, but not to short wavelengths (except under special geometries [13]). Magnons can be injected electrically by metallic contacts [14,15], but only in rather small numbers. Here, we focus on the coherent coupling of magnetic order and infrared laser light with sub-µm wavelengths, that is enhanced by using the magnet as an optical cavity [16][17][18].By the high dielectric constant and almost perfect transparency in the infrared [19,20], sub-mm YIG spheres support long-living whispering gallery modes (WGMs) [16,21]. The photons, with energy deep within the band gap, scatter inelastically by absorbing or creating magnons [22,23]. This is known as Brillouin light scattering (BLS) [24], which is enhanced in an optical cavity [16-18, 21, 25-29]. These results led to predictions of the Purcell effect [30] (optically induced enhancement of magnon linewidth), magnon lasing [31] and magnon cooling [32]. However, the models addressed only the magnetostatic magnon modes, i.e. ignored retardation and the exchange interaction, with only small overlap with the WGMs [16-18, 25, 29, 33, 34]. Thus, the observed and predicted coupling rates were too low to be able to optically manipulate magnons [31,32]. Higher optomagnonic coupling can be achieved by reducing the size of the magnets down to optical wavelengths [35], but this requires nanostructuring of the magnet [36][37][38]. Coupling to magnons in a non-uniform magnetization texture is large [39]. Here, we suggest and analyze a method to increase coupling in a conventional set-up of a uniformly magnetized sub-mm YIG sphere by coupling to exchange-dipolar modes with wavelengths comparable to the WGMs.Bulk magnons in films with both exchange and dipo-lar interactions have been extensively studied [40][41][42]. In thick films, exchange reduces the life tim...

show abstract

“…5 + = ε [1] and the value of g is tunable in the range of 0 -0.3 by adjusting the magnetic field [48,49]. Since its 6 nm thick films demonstrate 5 3.8 10 esu m χ − ≈ × [50], the maximal value of gyration which can be reached in practice corresponds to the magnetic field ~ 7.8 kG (or 0.78 T). Note that here, for the sake of clarity, we ignore the metallic nonlocality which potentially may lead to spectral shifting of the Fano resonance peak and enhancement of the nonlinear response [51].…”

Section: Theoretical Modelsmentioning

confidence: 99%

Optical tristability and ultrafast Fano switching in nonlinear magnetoplasmonic nanoparticles

Sun

et al. 2018

Phys. Rev. B

View full text Add to dashboard Cite

We consider light scattering by a coated magneto-plasmonic nanoparticle (MPNP) with a Kerr-type nonlinear plasmonic shell and a magneto-optic core. Such structure features two plasmon dipole modes, associated with electronic oscillations on the inner and outer surfaces of the shell. Driven in a nonlinear regime, each mode exhibits a bistable response. Bistability of an inner plasmon leads to switching between this state and a Fano resonance (Fano switching). Once the external light intensity exceeds the critical value, the bistability zones of both eigen modes overlap yielding optical tristability characterized by three stable steady states for a given wavelength and light intensity. We develop a dynamic theory of transitions between nonlinear steady states and estimate the characteristic switching time as short as 0.5 ps. We also show that the magneto-optical (MO) effect allows red-and blue-spectral shift of the Fano profile for right-and left-circular polarizations of the external light, rendering Fano switching sensitive to the light polarization. Specifically, one can reach Fano switching for the right circular polarization while cancelling it for the left circular polarization. Our results point to a novel class of ultrafast Fano switchers tunable by magnetic field for applications in nanophotonics.

show abstract

Magneto-optics of nanoscale Bi:YIG films

Cited by 29 publications

References 17 publications

Large magneto-optic enhancement in ultra-thin liquid-phase-epitaxy iron garnet films

Large magneto-optic enhancement in ultra-thin liquid-phase-epitaxy iron garnet films

Optimal mode matching in cavity optomagnonics

Optical tristability and ultrafast Fano switching in nonlinear magnetoplasmonic nanoparticles

Contact Info

Product

Resources

About