Brillouin light scattering study of magnetic-element normal modes in a square artificial spin ice geometry

Li, Yue; Gubbiotti, G.; Casoli, F.; Gonçalves, F. J. T.; Morley, Sophie A.; Rosamond, Mark C.; Linfield, Edmund H.; Marrows, C. H.; McVitie, S.; Stamps, R. L.

doi:10.1088/1361-6463/50/1/015003

Cited by 28 publications

(25 citation statements)

References 33 publications

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“…In conclusion, the above study, apart from its intrinsic interest, has strong implications with regard to artificial spin ice studies involving lattices formed from clusters of the type examined. Unlike previous reports [17][18][19][20], what our study demonstrates is that the spectra of lattices involving weakly coupled clusters of individual macrospins may be viewed as a superposition of the spectra of those macrospins. Using this additivity principle, intensity measurements could then yield the fraction of the individual macrospins presenting different angles with respect to the external magnetic field.…”

Section: Discussioncontrasting

confidence: 74%

“…The static and dynamic response of spin ice lattices is generally rather complex [8,10,14], especially when complex magnetization distributions are concerned, arising from frustrated configurations or arbitrary magnetic field orientations [15,16]. Li et al [17,18] reported Brillouin scattering measurements of spin wave modes in a square spin ice consisting of rectangular blocks for two different directions of the applied magnetic field and multiple thicknesses. However, their simulations were limited to the single and bi-elements elements making up the array.…”

Section: Introductionmentioning

confidence: 99%

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Angular-dependent spin dynamics of a triad of permalloy macrospins

et al. 2019

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We experimentally and theoretically characterize the angular dependent microwave response of three-macrospin-vertex structures that can serve as a node in various spin ice lattices. The macrospins consist of patterned permalloy thin films with an elliptical cross-section together with an in-plane aspect ratio allowing an Ising-like behavior together with bulk modes as low-frequency excitations in the field range of interest. Various branches of the frequency-magnetic field curves display atypical behaviors and discontinuities, together with softening due to macrospin reversals. The overall behavior observed accurately corresponds to a superposition of the spectra of the individual macrospins. The measured ferromagnetic resonance spectra are in good agreement with theoretical modeling. In particular, they reveal a close correlation between the field direction (relative to the individual macrospins), and the corresponding frequency-magnetic field curve; i.e., between the geometry and the magnetic response.

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Section: Discussioncontrasting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Angular-dependent spin dynamics of a triad of permalloy macrospins

et al. 2019

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“…24. The resonant modes in square ice have been mapped by Li et al 72 using micro-BLS. Recently, anti-spin ice systems consisting in thin films with geometrically-placed holes instead of nanoislands (analogous to antidots), have also been studied using BLS.…”

Section: A Square Icementioning

confidence: 99%

Dynamics of reconfigurable artificial spin ice: Toward magnonic functional materials

2020

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Over the past few years, the study of magnetization dynamics in artificial spin ices has become a vibrant field of study. Artificial spin ices are ensembles of geometrically arranged, interacting magnetic nanoislands, which display frustration by design. These were initially created to mimic the behavior in rare earth pyrochlore materials and to study emergent behavior and frustration using two-dimensional magnetic measurement methods. Recently, it has become clear that it is possible to create artificial spin ices, which can potentially be used as functional materials. In this Perspective, we review the resonant behavior of spin ices (which is in the GHz frequency range), focusing on their potential application as magnonic crystals. In magnonic crystals, spin waves are functionalized for logic applications by means of band structure engineering. While it has been established that artificial spin ices can possess rich mode spectra, the applicability of spin ices to create magnonic crystals hinges upon their reconfigurability. Consequently, we describe recent work aiming to develop techniques and create geometries allowing full reconfigurability of the spin ice magnetic state. We also discuss experimental, theoretical, and numerical methods for determining the spectral response of artificial spin ices, and give an outlook on new directions for reconfigurable spin ices. arXiv:1912.07280v1 [cond-mat.mes-hall]

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“…Mesoscopic segments having an elongated (e.g., elliptical or bar-like) cross section have been used to assemble interconnected lattices such as those used in artificial spin ice studies, which is a topic of considerable recent activity. [1][2][3][4] The magnetic response of the individual segments themselves is also of interest, and the case of permalloy ellipses has been studied via Brillouin scattering for magnetic fields along the in-plane principal axes, [5][6][7][8] and via the timeresolved magneto-optic Kerr effect (TR-MOKE). 9 We recently completed a study of the microwave response of three-fold, 120°-symmetric, clusters of such ellipses 10 and their angular dependence 11 ; our future intension is to incorporate these vertices into honeycomb or Kagome spin-ice lattices.…”

Section: Introductionmentioning

confidence: 99%

Ferromagnetic resonance spectra of permalloy nano-ellipses as building blocks for complex magnonic lattices

Bang

Montoncello

Kaffash

et al. 2019

Journal of Applied Physics

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We report the experimental and theoretical characterization of the angulardependent magnetic field and microwave frequency dependence of the response of isolated mesoscopic permalloy nano-ellipses for geometries in which the static magnetic field is both parallel to and perpendicular to the microwave magnetic field. These spectra form a basis for interpreting the ferromagnetic resonance (FMR) spectra of lattices based on such structures, including those containing frustrated regions, such as artificial spin ice structures.

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Brillouin light scattering study of magnetic-element normal modes in a square artificial spin ice geometry

Cited by 28 publications

References 33 publications

Angular-dependent spin dynamics of a triad of permalloy macrospins

Angular-dependent spin dynamics of a triad of permalloy macrospins

Dynamics of reconfigurable artificial spin ice: Toward magnonic functional materials

Ferromagnetic resonance spectra of permalloy nano-ellipses as building blocks for complex magnonic lattices

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