Spin wave filtering and guiding in Permalloy/iron nanowires

Silvani, Raffaele; Kostylev, Mikhail; Adeyeye, A. O.; Gubbiotti, G.

doi:10.1016/j.jmmm.2017.03.046

Cited by 18 publications

(9 citation statements)

References 29 publications

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“…[10,11,12] In most of the cases, the lowest frequency mode, only, presents a significant dispersion and can be used for carrying and processing information in magnonic devices. [2] Later on, several types of NW arrays have been investigated, including NWs with: magnetizationmodulation, [3,4] asymmetrically sawtooth-shaped notched, [5] alternated width, [6,7] bend sections, [8,9] localized ion implantation, [10] two alternating ferromagnetic material [11,12] and layered structure where two ferromagnetic layers are either exchange [13,14,15] or dipolarly coupled. [16] More in detail, micromagnetic and experimental studies on width-modulated NWs were exclusively performed to understand the SW propagation properties along their length and how it is affected by the profile of the width modulation.…”

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confidence: 99%

Collective spin waves in arrays of permalloy nanowires with single-side periodically modulated width

Gubbiotti

Xiong

Montoncello

et al. 2017

Applied Physics Letters

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We have experimentally and numerically investigated the dispersion of collective spin waves propagating through arrays of longitudinally magnetized nanowires (NWs) with a periodically modulated width. Two nanowire arrays with single-side modulation and different periodicities of modulation were studied and compared to the nanowires with a homogeneous width. The spin-wave dispersion, measured up to the third Brillouin zone of the reciprocal space, revealed the presence of two dispersive modes for the width-modulated NWs, whose amplitude of the magnonic band depends on the modulation periodicity, and a set of nondispersive modes at higher frequency. These findings are different from those observed in homogeneous width NWs where only the lowest mode exhibits sizeable dispersion. The measured spin-wave dispersion has been satisfactorily reproduced by means of the dynamical matrix method. The results presented in this work are important in view of the possible realization of tunable frequency magnonic devices

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confidence: 99%

Collective spin waves in arrays of permalloy nanowires with single-side periodically modulated width

Gubbiotti

Xiong

Montoncello

et al. 2017

Applied Physics Letters

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“…The mode frequencies delivered by these calculations are very close to those obtained with the microscopic Hamiltonian-based theory 22 . More generally, the consistency between the microscopic and macroscopic approaches to SW dynamics in nanostructure arrays has been discussed in refs 29 , 45 .…”

Section: Theorymentioning

confidence: 95%

“…a continuous film and an array of magnetic dots or wires deposited on top or by using layered arrays of magnetic elements with or without a non-magnetic spacer. [24,25,26,27,28,29,30] Following this idea, we have recently demonstrated the possibility of controlling the MBS by switching between different magnetization configurations, parallel (P) and anti-parallel (AP), in dense arrays of Py/Cu(10nm)/Py nanowires (NWs) with different separations and where the two Py (Permalloy, Ni80Fe20) layers have different thickness, i.e. 30 and 10 nm.…”

Section: Introductionmentioning

confidence: 99%

Interplay between intra- and inter-nanowires dynamic dipolar interactions in the spin wave band structure of Py/Cu/Py nanowires

Gubbiotti

Zhou

Haghshenasfard

et al. 2019

Sci Rep

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We have studied both experimentally and theoretically the reprogrammable spin wave band structure in Permalloy(10 nm)/Cu(5 nm)/Permalloy(30 nm) nanowire arrays of width w = 280 nm and inter-wire separation in the range from 80 to 280 nm. We found that, depending on the inter-wire separation, the anti-parallel configuration, where the magnetizations of the two Permalloy layers point in opposite directions, is stabilized over specific magnetic field ranges thus enabling us to directly compare the band structure with that of the parallel alignment. We show that collective spin waves of the Bloch type propagate through the arrays with different magnonic bandwidths as a consequence of the interplay between the intra- and inter-nanowire dynamic dipolar interactions. A detailed understanding, e.g. whether they have a stationary or propagating character, is achieved by considering the phase relation (in-phase or out-of-phase) between the dynamic magnetizations in the two ferromagnetic layers and their average value. This work opens the path to magnetic field-controlled reconfigurable layered magnonic crystals that can be used for future nanoscale magnon spintronic devices.

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“…Excellent magnetic properties of permalloy increase the number of NiFe alloy applications such as: spin valves [13], spin-wave multiplexer [14], spin-wave signal splitter [15] and also in racetrack memory [16]. Nowadays, pure Py alloys and multilayers with Py [17], the Py nanowires [18], filtering or guiding layers [19] are investigated. Different excitation methods of spin waves in Py are developed e.g.…”

Section: Introductionmentioning

confidence: 99%

Impact of the Effects of Sample Geometry and Forms on the Magnetic Properties of NiFeCuMo Alloy

2019

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The investigations of magnetic properties were focused on the influence of sample thickness on coercivity and permeability of magnetic substrates made of NiFeCuMo alloy. The transition from 2 mm thick samples to 200 nm films samples resulted in a significant increase in coercivity and a reduction in permeability. The deterioration of the magnetic properties of NiFeCuMo thin layers required 1000 times higher external magnetizing field than the typical coercive field for pre-annealed NiFeCuMo sheets and bulk forms.

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Spin wave filtering and guiding in Permalloy/iron nanowires

Cited by 18 publications

References 29 publications

Collective spin waves in arrays of permalloy nanowires with single-side periodically modulated width

Collective spin waves in arrays of permalloy nanowires with single-side periodically modulated width

Interplay between intra- and inter-nanowires dynamic dipolar interactions in the spin wave band structure of Py/Cu/Py nanowires

Impact of the Effects of Sample Geometry and Forms on the Magnetic Properties of NiFeCuMo Alloy

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