Dynamic separation of nanomagnet sublattices by orientation of elliptical elements

Yahagi, Y.; Berk, Cassidy; Harteneck, B.; Cabrini, Stefano; Schmidt, Holger

doi:10.1063/1.4873340

Cited by 10 publications

(8 citation statements)

References 19 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: 75%

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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: 75%

“…al. [19] also utilized Brillouin spectra to observed spin wave modes from different sub-lattices, however metastable behavior arising from magnetization reversal, an important property, was not studied.…”

Section: Introductionmentioning

confidence: 99%

Angular-dependent spin dynamics of a triad of permalloy macrospins

et al. 2019

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“…Previous studies have used SAWs to excite and detect the magnetization dynamics of films [19][20][21] and nanomagnet arrays [22][23][24], and found that a magneto-elastic resonance occurs which pins magnetic response to the SAW frequency ( SAW f ) over a range of applied fields. Thus, magneto-elastic coupling has been established as an alternative means to study the dynamic properties of magnetic.…”

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confidence: 99%

Magnetoelastic excitation of single nanomagnets for optical measurement of intrinsic Gilbert damping

et al. 2018

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We report a novel all-optical technique to drive and probe the spin dynamics of single nanomagnets. Optically generated surface acoustic waves (SAWs) drive the magnetization precession in nanomagnets via magneto-elastic (MEL) coupling. We investigate the field-swept dynamics of isolated Ni nanomagnets at various SAW frequencies, and show that this method can be used to accurately determine the intrinsic Gilbert damping of nanostructured magnetic materials. This technique opens a new avenue for studying the spin dynamics of nanoscale devices using non-thermal ("cold") excitation, enabling direct observation of the MEL driven dynamics.

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“…Despite the close proximity of the nanomagnets, we observe no significant change in H res due to magnetostatic interactions between nanomagnets, which was confirmed by micromagnetic simulations. [22] These measurements unambiguously show that the SAW-driven precession of magnetic nanostructures can be selectively controlled via an externally applied magnetic field.…”

Section: Methodsmentioning

confidence: 70%

Preferential excitation of a single nanomagnet using magnetoelastic coupling

et al. 2019

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We report preferential excitation and detection of the precessional spin dynamics of individual nanomagnets via magneto-elastic (MEL) resonance excitation. Surface acoustic waves (SAWs) are generated by the ultrafast optical excitation of a non-magnetic grating (Al bars) with lithographically defined acoustic eigenmodes. We show that the precessional spin dynamics in two identical, elliptical nanomagnets with orthogonal orientations can be selectively excited by the SAWs via control of the applied magnetic field. Furthermore, we observe that both the amplitude and damping of the magneto-elastically induced precession depend on the relative orientation of the SAW with respect to the nanomagnets. Using magneto-mechanical simulations, we show that the acoustic excitation is most efficient when the spatial distributions of the natural and SAW-driven magnetic resonances match. These findings reveal a direct connection between the geometry and MEL excitation efficiency and have implications for the rational design of nanoscale magneto-mechanical devices.

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Dynamic separation of nanomagnet sublattices by orientation of elliptical elements

Cited by 10 publications

References 19 publications

Angular-dependent spin dynamics of a triad of permalloy macrospins

Angular-dependent spin dynamics of a triad of permalloy macrospins

Magnetoelastic excitation of single nanomagnets for optical measurement of intrinsic Gilbert damping

Preferential excitation of a single nanomagnet using magnetoelastic coupling

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