Properties of Magnetostatic Modes in Ferrimagnetic Spheroids

Röschmann, P.; Dötsch, H.

doi:10.1002/pssb.2220820102

Cited by 43 publications

(33 citation statements)

References 34 publications

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“…Here, for simplicity, we employ a simplified twoindex notation dropping the third number referring to the number of the solution [46]. This estimation of the saturation magnetization at 20 mK is in good agreement with previous measurements [49] where it is demonstrated that M grows from 0.175 T at 300 K to 0.244 T at 4 K. Visualizations of magnon modes in a sphere have been computed in the past [48]. The only parameter of the model M is fitted in such a way that the observed mode structure matches the predicted one.…”

Section: Experimental Observationssupporting

confidence: 84%

“…Thus, the M 1 mode does not interact with the dark cavity mode due to the resonant magnetic rf field reversing direction within the sphere, which causes first-order cancellation of the coupling. The strong coupling to the M 3 mode suggests it has two variations of the magnon phase in the azimuthal direction [48]. Thus, it is clear from these results that one must take into account the mode shapes of both the photonic and magnon resonances inside the sphere to properly calculate the coupling for a general photon-magnon-mode interaction.…”

Section: Experimental Observationsmentioning

confidence: 89%

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High-Cooperativity Cavity QED with Magnons at Microwave Frequencies

et al. 2014

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Using a submillimeter-sized YIG (yttrium-iron-garnet) sphere mounted in a magnetic-field-focusing cavity, we demonstrate an ultrahigh cooperativity of 10 5 between magnon and photon modes at millikelvin temperatures and microwave frequencies. The cavity is designed to act as a magnetic dipole by using a novel multiple-post approach, effectively focusing the cavity magnetic field within the YIG crystal with a filling factor of 3%. Coupling strength (normal-mode splitting) of 2 GHz (equivalent to 76 cavity linewidths or 0.3 Hz per spin) is achieved for a bright cavity mode that constitutes about 10% of the photon energy and shows that ultrastrong coupling is possible in spin systems at microwave frequencies. With straightforward optimizations we demonstrate that this system has the potential to reach cooperativities of 10 7 , corresponding to a normal-mode splitting of 5.2 GHz and a coupling per spin approaching 1 Hz. We also observe a three-mode strong-coupling regime between a dark cavity mode and a magnon-mode doublet pair, where the photon-magnon and magnon-magnon couplings (normal-mode splittings) are 143 and 12.5 MHz, respectively, with a HWHM bandwidth of about 0.5 MHz.

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Section: Experimental Observationssupporting

confidence: 84%

Section: Experimental Observationsmentioning

confidence: 89%

High-Cooperativity Cavity QED with Magnons at Microwave Frequencies

et al. 2014

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“…At fixed z there is nearly no variation of the PM-FMR signal along y. These spatial variations of the PM signal agree with the predictions obtained from the calculated magnetization patterns [6] along the z- (Fig. 4a) and the y-direction (Fig.…”

Section: Resultssupporting

confidence: 89%

Photothermally modulated spatially resolved FMR detection of Walker modes in yttrium iron garnet spheres

et al. 1994

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Abstract:The photothermally modulated (PM) ferromagnetic resonance (FMR) combines the high sensitivity of conventional FMR and spatial resolution. This technique has been applied to a single-crystalline yttrium iron garnet (YIG) sphere with a diameter of 2 mm. For the first time, the spatial variation of the high-frequency magnetization patterns known as Walker modes were visualized and it is thus shown that PM-FMR can even be applied to unfavourable geometries.

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“…The above approximations allow to obtain magnetization eigenmodes, known in the literature as Magnetostatic Dipolar Spin Waves, or Walker modes [58][59][60]. The Walker eigenmodes are labeled by a compound multiindex β ≡ {lmn}, with l = 1, 2, 3, ..., m ∈ [−l, l], and n = 0, 1, 2, ..., n max (l).…”

Section: B Magnon Hamiltonianmentioning

confidence: 99%

Theory of quantum acoustomagnonics and acoustomechanics with a micromagnet

et al. 2020

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Recently [1], we proposed a new way to engineer a flexible acoustomechanical coupling between the center-of-mass motion of an isolated micromagnet and one of its internal acoustic phonons by using a magnon as a passive mediator. In our approach, the coupling is enabled by the strong magnetoelastic interaction between magnons and acoustic phonons which originates from the small particle size. Here, we substantially extend our previous work. First, we provide the full theory of the quantum acoustomagnonic interaction in small micromagnets and analytically calculate the magnon-phonon coupling rates. Second, we fully derive the acoustomechanical Hamiltonian presented in Ref. [1]. Finally, we extend our previous results for the fundamental acoustic mode to higher order modes. Specifically, we show the cooling of the center-of-mass motion with a range of internal acoustic modes. Additionally, we derive the power spectral densities of the center-of-mass motion which allow to probe the same acoustic modes. arXiv:1912.08745v2 [cond-mat.mes-hall]

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Properties of Magnetostatic Modes in Ferrimagnetic Spheroids

Cited by 43 publications

References 34 publications

High-Cooperativity Cavity QED with Magnons at Microwave Frequencies

High-Cooperativity Cavity QED with Magnons at Microwave Frequencies

Photothermally modulated spatially resolved FMR detection of Walker modes in yttrium iron garnet spheres

Theory of quantum acoustomagnonics and acoustomechanics with a micromagnet

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