Observation and control of collective spin-wave mode hybridization in chevron arrays and in square, staircase, and brickwork artificial spin ices

Dion, Troy; Gartside, Jack C.; Vanstone, Alex; Stenning, Kilian D.; Arroo, Daan M.; Kurebayashi, Hidekazu; Branford, W. R.

doi:10.1103/physrevresearch.4.013107

Cited by 17 publications

(15 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4(a), that consists of a lattice of lithographically patterned nanometer-scale magnets, arranged in a square geometry, which exhibits magnetic frustration. Such systems are characterized by collective excitations, including emergent magnetic monopoles [29,[31][32][33][34] and magnonic modes [35][36][37]. Figure 4(b) shows the sample's topography imaged using the SQUID-onlever probe in constant-frequency mode with a set-point of f = −120 Hz, corresponding to z = 65 nm.…”

Section: Imaging An Array Of Nanomagnetsmentioning

confidence: 99%

Magnetic, Thermal, and Topographic Imaging with a Nanometer-Scale SQUID-On-Lever Scanning Probe

et al. 2022

View full text Add to dashboard Cite

Scanning superconducting quantum interference device (SQUID) microscopy is a magnetic imaging technique combining high field sensitivity with nanometer-scale spatial resolution. Here, we demonstrate a scanning probe that combines the magnetic and thermal imaging provided by an on-tip SQUID with the tip-sample distance control and topographic contrast of a noncontact atomic force microscope (AFM). We pattern the nanometer-scale SQUID, including its weak-link Josephson junctions, via focused-ionbeam milling at the apex of a cantilever coated with Nb, yielding a sensor with an effective diameter of 365 nm, field sensitivity of 9.5 nT/ √ Hz, and thermal sensitivity of 620 nK/ √ Hz, operating in magnetic fields up to 1.0 T. The resulting SQUID-on-lever probe is a robust AFM-like scanning probe that expands the reach of sensitive nanometer-scale magnetic and thermal imaging beyond what is currently possible.

show abstract

Section: Imaging An Array Of Nanomagnetsmentioning

confidence: 99%

Magnetic, Thermal, and Topographic Imaging with a Nanometer-Scale SQUID-On-Lever Scanning Probe

et al. 2022

View full text Add to dashboard Cite

show abstract

“…We refer to this type of coupling as dynamic coupling. Previous works reported various types of mode hybridizations [17][18][19]48,49 and conversion 50,51 . However, hybridization in these cases occurred among modes relative to the same system geometry, and hence the same underlying magnetization.…”

Section: B Mode Dynamics and Asi-film Couplingmentioning

confidence: 99%

“…These degenerate energy landscapes and the associated magnetic ordering in the lattice [2][3][4][5][6][7][8][9][10][11][12][13] enable the realization of reconfigurable magnonic crystals and devices. Various approaches have been proposed to utilize reconfigurability for an on-demand manipulation of the spinwave (SW) propagation characteristics, dispersion [14][15][16][17] and hybridizations [18][19][20] . To this end, Bhat et al demonstrated spatially localized SW modes in a connected Kagome lattice by microfocused Brillouin light scattering (BLS) 21 , while Kaffash et al revealed SW channels in a honeycomb array of nanodisks using microfocused BLS 22 .…”

Section: Introductionmentioning

confidence: 99%

Dynamic coupling and spin-wave dispersions in a magnetic hybrid system made of an artificial spin-ice structure and an extended NiFe underlayer

et al. 2022

View full text Add to dashboard Cite

We present a combined experimental and numerical study of the spin-wave dispersion in a NiFe artificial spin-ice (ASI) system consisting of an array of stadium-shaped nanoislands deposited on the top of a continuous NiFe film with non-magnetic spacer layers of varying thickness. The spin-wave dispersion, measured by wavevector resolved Brillouin light scattering spectroscopy in the Damon–Eshbach configuration, consists of a rich number of modes, with either stationary or propagating character. We find that the lowest frequency mode displays a bandwidth of ∼0.5 GHz, which is independent of the presence of the film underneath. On the contrary, the Brillouin light scattering intensity of some of the detected modes strongly depends on the presence of the extended thin-film underlayer. Micromagnetic simulations unveil the details of the dynamic coupling between the ASI lattice and film underlayer. Interestingly, the ASI lattice facilitates dynamics of the film either specific wavelengths or intensity modulation peculiar to the modes of the ASI elements imprinted in the film. Our results demonstrate that propagating spin waves can be modulated at the nanometer length scale by harnessing the dynamic mode coupling in the vertical, i.e., the out-of-plane direction of suitably designed magnonic structures.

show abstract

“…Ferromagnetic resonance (FMR) spectroscopy measures spin-wave spectra and has proved a potent tool for studying ASI based reconfigurable magnonic crystals [10][11][12][13][14][15][16]. In a seminal work, Gliga et al [10] predicted that FMR may be used for the quantitative detection of the population and separation of magnetic charge defects in square ASI.…”

Section: Introductionmentioning

confidence: 99%

Spectral fingerprinting: microstate readout via remanence ferromagnetic resonance in artificial spin ice

et al. 2022

Self Cite

View full text Add to dashboard Cite

Artificial spin ices are magnetic metamaterials comprising geometrically tiled strongly-interacting nanomagnets. There is significant interest in these systems spanning the fundamental physics of many-body systems and potential applications in neuromorphic computation, logic, and recently reconfigurable magnonics. Magnonics-focused studies on ASI have to date have focused on the in-field GHz spin-wave response, convoluting effects from applied field, nanofabrication imperfections ('quenched disorder') and microstate-dependent dipolar field landscapes. Here, we investigate zero-field measurements of the spin-wave response and demonstrate its ability to provide a ‘spectral fingerprint’ of the system microstate. Removing applied field allows deconvolution of distinct contributions to reversal dynamics from the spin-wave spectra, directly measuring dipolar field strength and quenched disorder as well as net magnetisation. We demonstrate the efficacy and sensitivity of this approach by measuring ASI in three microstates with identical (zero) magnetisation, indistinguishable via magnetometry. The zero-field spin-wave response provides distinct spectral fingerprints of each state, allowing rapid, scaleable microstate readout. As artificial spin systems progress toward device implementation, zero-field functionality is crucial to minimise the power consumption associated with electromagnets. Several proposed hardware neuromorphic computation schemes hinge on leveraging dynamic measurement of ASI microstates to perform computation for which spectral fingerprinting provides a potential solution.

show abstract

Observation and control of collective spin-wave mode hybridization in chevron arrays and in square, staircase, and brickwork artificial spin ices

Cited by 17 publications

References 44 publications

Magnetic, Thermal, and Topographic Imaging with a Nanometer-Scale SQUID-On-Lever Scanning Probe

Magnetic, Thermal, and Topographic Imaging with a Nanometer-Scale SQUID-On-Lever Scanning Probe

Dynamic coupling and spin-wave dispersions in a magnetic hybrid system made of an artificial spin-ice structure and an extended NiFe underlayer

Spectral fingerprinting: microstate readout via remanence ferromagnetic resonance in artificial spin ice

Contact Info

Product

Resources

About