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Investigation of magnetization dynamics in trilayer width-modulated nanowires (2024)
Journal Article
Kuchibhotla, M., Haldar, A., & Adeyeye, A. O. (2024). Investigation of magnetization dynamics in trilayer width-modulated nanowires. Journal of Applied Physics, 135(10), Article 103903. https://doi.org/10.1063/5.0191447

We have investigated the magnetization reversal processes and dynamic behavior of trilayered Py(50 nm)/Pd(tPd)/Py(20 nm) nanowires with periodic width modulation as a function of spacer layer thickness tPd in the range from 0 to 10 nm and compared th... Read More about Investigation of magnetization dynamics in trilayer width-modulated nanowires.

Tunable 2-D magnonic crystals: effect of packing density (2024)
Journal Article
Tian, C., & Adeyeye, A. O. (2024). Tunable 2-D magnonic crystals: effect of packing density. Nanoscale, https://doi.org/10.1039/d3nr05582e

Magnonic crystals, periodic arrays of magnetic structures, have emerged as a promising platform for manipulating and controlling spin waves in magnetic materials. Magnetic antidot nanostructures, representing 2-D magnonic crystals, are versatile plat... Read More about Tunable 2-D magnonic crystals: effect of packing density.

Tuning magnon spectra via interlayer coupling in pseudo-3D nanostructured artificial spin ice arrays (2023)
Journal Article
de Rojas, J., Atkinson, D., & Adeyeye, A. O. (2023). Tuning magnon spectra via interlayer coupling in pseudo-3D nanostructured artificial spin ice arrays. Applied Physics Letters, 123(23), Article 232407. https://doi.org/10.1063/5.0177447

We have investigated the static and dynamic behavior of “pseudo-3D” trilayer square artificial spin ice structures. The trilayer stack comprises of two ferromagnetic Ni81Fe19 (Permalloy, Py) layers with 30 and 70 nm thickness, separated by a nonmagne... Read More about Tuning magnon spectra via interlayer coupling in pseudo-3D nanostructured artificial spin ice arrays.

Magnetization dynamics of elastically strained nanostructures studied by coupled micromagnetic-mechanical simulations (2023)
Journal Article
Chiroli, S., Faurie, D., Haboussi, M., Adeyeye, A. O., & Zighem, F. (2023). Magnetization dynamics of elastically strained nanostructures studied by coupled micromagnetic-mechanical simulations. Physical Review B, 108, Article 024406. https://doi.org/10.1103/PhysRevB.108.024406

Elastically strained ferromagnetic objects have been studied by coupled micromagnetic-mechanical numerical simulations. Both temporal evolution of the magnetization and modal frequency analysis of ferromagnetic thin films and arrays of nanostructures... Read More about Magnetization dynamics of elastically strained nanostructures studied by coupled micromagnetic-mechanical simulations.

Tuning spin wave modes in yttrium iron garnet films with stray fields (2022)
Journal Article
Chaudhuri, U., Singh, N., Mahendiran, R., & Adeyeye, A. O. (2022). Tuning spin wave modes in yttrium iron garnet films with stray fields. Nanoscale, 14(33), 12022 - 12029. https://doi.org/10.1039/d2nr00618a

The nanopatterning of Yttrium Iron Garnets (YIGs) has proven to be a non-trivial problem even with advances in modern lithography techniques due to non-compatibility with a conventional complementary metal oxide semiconductor platform. In an attempt... Read More about Tuning spin wave modes in yttrium iron garnet films with stray fields.

Elongation of skyrmions by Dzyaloshinskii–Moriya interaction in helimagnetic films (2022)
Journal Article
Dai, Y., Wang, H., Yang, T., Adeyeye, A. O., & Zhang, Z. (2022). Elongation of skyrmions by Dzyaloshinskii–Moriya interaction in helimagnetic films. Rare Metals, 41(9), 3150-3159. https://doi.org/10.1007/s12598-022-02023-z

Distortion of skyrmions arouses much attention recently due to the exotic topological and dynamic properties. Investigating the formation mechanism and dynamical behavior of the deformed skyrmions promotes practical spintronic applications. Elongatio... Read More about Elongation of skyrmions by Dzyaloshinskii–Moriya interaction in helimagnetic films.

Engineering spin wave spectra in thick Ni80Fe20 rings by using competition between exchange and dipolar fields (2021)
Journal Article
Zhou, X., Tartakovskaya, E., Kakazei, G., & Adeyeye, A. (2021). Engineering spin wave spectra in thick Ni80Fe20 rings by using competition between exchange and dipolar fields. Physical Review B, 104(21), Article 214402. https://doi.org/10.1103/physrevb.104.214402

Control of the spin wave dynamics in nanomagnetic elements is very important for the realization of a broad range of novel magnonic devices. Here we study experimentally the spin wave resonance in thick ferromagnetic rings (100 nm) using perpendicula... Read More about Engineering spin wave spectra in thick Ni80Fe20 rings by using competition between exchange and dipolar fields.

Prospects toward flexible magnonic systems (2021)
Journal Article
Faurie, D., Adeyeye, A., & Zighem, F. (2021). Prospects toward flexible magnonic systems. Journal of Applied Physics, 130(15), Article 150901. https://doi.org/10.1063/5.0055976

This paper presents the prospects for periodic magnetic nanostructures in the form of magnonic crystals on polymer substrates. Indeed, arrays of magnetic nanostructures on flexible substrates are promising for microwave applications in the GHz freque... Read More about Prospects toward flexible magnonic systems.

Magnetization dynamics of single and trilayer permalloy nanodots (2021)
Journal Article
Kuchibhotla, M., Talapatra, A., Haldar, A., & Adeyeye, A. O. (2021). Magnetization dynamics of single and trilayer permalloy nanodots. Journal of Applied Physics, 130(8), Article 083906. https://doi.org/10.1063/5.0060689

We have investigated the magnetization dynamics in single and trilayer circular permalloy nanodots with a diameter of 120 nm using broadband ferromagnetic resonance spectroscopy. For single-layer nanodots, two well-separated modes near the saturation... Read More about Magnetization dynamics of single and trilayer permalloy nanodots.

Functional magnetic waveguides for magnonics (2021)
Journal Article
Haldar, A., & Adeyeye, A. O. (2021). Functional magnetic waveguides for magnonics. Applied Physics Letters, 119(6), Article 060501. https://doi.org/10.1063/5.0061528

Magnonics, or spin wave based spintronics, is an emerging technology where magnons—quanta for spin waves—process the information analogous to electronic charges in electronics. We introduce the fundamental components of a magnonic device and briefly... Read More about Functional magnetic waveguides for magnonics.

Differentiated Strain-Control of Localized Magnetic Modes in Antidot Arrays (2021)
Journal Article
Challab, N., Faurie, D., Haboussi, M., Adeyeye, A. O., & Zighem, F. (2021). Differentiated Strain-Control of Localized Magnetic Modes in Antidot Arrays. ACS Applied Materials and Interfaces, 13(25), 29906-29915. https://doi.org/10.1021/acsami.1c05582

The control of localized magnetic modes has been obtained in Ni60Fe40 square lattice (600 nm) antidot arrays. This has been performed by tailoring the magnetoelastic field at the scale of the antidot primitive cell. The corresponding heterogeneous st... Read More about Differentiated Strain-Control of Localized Magnetic Modes in Antidot Arrays.

Coupled magnetic nanostructures: Engineering lattice configurations (2021)
Journal Article
Talapatra, A., & Adeyeye, A. (2021). Coupled magnetic nanostructures: Engineering lattice configurations. Applied Physics Letters, 118(17), Article 172404. https://doi.org/10.1063/5.0045235

We present a systematic investigation of tunable magnetization dynamics of coupled magnetic nanostructures, arranged in one-dimensional arrays of horizontally and vertically coupled linear chains and in two-dimensional arrays of square artificial spi... Read More about Coupled magnetic nanostructures: Engineering lattice configurations.

Reconfigurable and self-biased magnonic metamaterials (2020)
Journal Article
Haldar, A., & Adeyeye, A. O. (2020). Reconfigurable and self-biased magnonic metamaterials. Journal of Applied Physics, 128(24), Article 240902. https://doi.org/10.1063/5.0033254

In magnonics, magnetic waves and oscillations are exploited for signal and information processing at microwave frequencies. A magnonic metamaterial is employed to configure different microwave bands by spatial engineering of magnetizations using diff... Read More about Reconfigurable and self-biased magnonic metamaterials.

Platinum composition dependence of spin-orbit torque in (Fe0.8Mn0.2)1−xPtx single-layer ferromagnet (2020)
Journal Article
Luo, Z., Lu, L., Xie, H., Xu, Y., Chen, X., Talapatra, A., …Wu, Y. (2020). Platinum composition dependence of spin-orbit torque in (Fe0.8Mn0.2)1−xPtx single-layer ferromagnet. Applied Physics Letters, 117(17), Article 172402. https://doi.org/10.1063/5.0023957

We have investigated the effect of the Pt composition on the spin–orbit torque in a (Fe0.8Mn0.2)1xPtx single-layer ferromagnet. We observed that while the field-like torque decreases and even reverses sign with increasing the Pt composition, the damp... Read More about Platinum composition dependence of spin-orbit torque in (Fe0.8Mn0.2)1−xPtx single-layer ferromagnet.

Linear chains of nanomagnets: engineering the effective magnetic anisotropy (2020)
Journal Article
Talapatra, A., & Adeyeye, A. (2020). Linear chains of nanomagnets: engineering the effective magnetic anisotropy. Nanoscale, 12(40), 20933-20944. https://doi.org/10.1039/d0nr06026g

This paper investigates the control of effective magnetic anisotropy in Permalloy linear chain arrays, achieved by tuning the symmetry arrangement of the ellipsoidal nanomagnets and the film thickness. When the ellipsoidal nanomagnets are coupled alo... Read More about Linear chains of nanomagnets: engineering the effective magnetic anisotropy.

Non-uniform along thickness spin excitations in magnetic vortex-state nanodots (2020)
Journal Article
Kakazei, G., Guslienko, K., Verba, R., Ding, J., Liu, X., & Adeyeye, A. (2020). Non-uniform along thickness spin excitations in magnetic vortex-state nanodots. Low Temperature Physics, 46(8), Article 863. https://doi.org/10.1063/10.0001555

We summarize our experimental findings in the arrays of Ni80Fe20 circular nanodots with diameter 300 nm and thickness 20 nm ≤ L ≤ 100 nm, probed by broadband ferromagnetic resonance spectroscopy in the absence of external magnetic field. Spin excitat... Read More about Non-uniform along thickness spin excitations in magnetic vortex-state nanodots.

Effect of exchange and dipolar interlayer interactions on the magnonic band structure of dense Fe/Cu/Py nanowires with symmetric and asymmetric layer widths (2020)
Journal Article
Gubbiotti, G., Zhou, X., Adeyeye, A., Varvaro, G., & Kostylev, M. (2020). Effect of exchange and dipolar interlayer interactions on the magnonic band structure of dense Fe/Cu/Py nanowires with symmetric and asymmetric layer widths. Physical Review B, 101(22), Article 224431. https://doi.org/10.1103/physrevb.101.224431

We present a systematic experimental and theoretical investigation of the magnonic band structure in dense arrays of both asymmetric and symmetric cross-section trilayered Fe(10 nm)/Cu( t )/Py(10 nm) nanowires (NWs). The Cu spacer thickness ( t ) is... Read More about Effect of exchange and dipolar interlayer interactions on the magnonic band structure of dense Fe/Cu/Py nanowires with symmetric and asymmetric layer widths.

Constraints on the Velocity and Spin Dependent Exotic Interaction at the Micrometer Range (2020)
Journal Article
Ding, J., Wang, J., Zhou, X., Liu, Y., Sun, K., Adeyeye, A. O., …Luo, J. (2020). Constraints on the Velocity and Spin Dependent Exotic Interaction at the Micrometer Range. Physical Review Letters, 124(16), Article 161801. https://doi.org/10.1103/physrevlett.124.161801

We report on an experimental test of the velocity and spin dependent exotic interaction that can be mediated by new light bosons. The interaction is searched by measuring the force between a gold sphere and a microfabricated magnetic structure using... Read More about Constraints on the Velocity and Spin Dependent Exotic Interaction at the Micrometer Range.

Microwave assisted gating of spin wave propagation (2020)
Journal Article
Haldar, A., & Adeyeye, A. O. (2020). Microwave assisted gating of spin wave propagation. Applied Physics Letters, 116(16), Article 162403. https://doi.org/10.1063/5.0006945

Magnonics is an emerging research area where magnons or spin waves are used as a medium of information processing. Efficient manipulation/gating of magnons on-chip is crucial for realization of logic circuitry and device integration. Here, we show a... Read More about Microwave assisted gating of spin wave propagation.

Magnetic Tunability of Permalloy Artificial Spin Ice Structures (2020)
Journal Article
Talapatra, A., Singh, N., & Adeyeye, A. (2020). Magnetic Tunability of Permalloy Artificial Spin Ice Structures. Physical Review Applied, 13(1), Article 014034. https://doi.org/10.1103/physrevapplied.13.014034

This paper reports tunable Ni80Fe20 artificial spin ice structures of various geometrical lattice arrangements as a function of film thickness. We achieve the magnetic tunability by three distinct methods namely, geometrical arrangements of nanomagne... Read More about Magnetic Tunability of Permalloy Artificial Spin Ice Structures.

Direct mapping of spin wave modes of individual Ni80Fe20 nanorings (2020)
Journal Article
Tian, C., Chaudhuri, U., Singh, N., & Adeyeye, A. O. (2020). Direct mapping of spin wave modes of individual Ni80Fe20 nanorings. Nanotechnology, 31(14), Article 145714. https://doi.org/10.1088/1361-6528/ab662f

Ferromagnetic nanorings exhibit tunable magnetic states with unique magnetization reversal processes and dynamic behavior that can be exploited in data storage and magnonic devices. Traditionally, probing the magnetization dynamics of individual ferr... Read More about Direct mapping of spin wave modes of individual Ni80Fe20 nanorings.

Large Area Artificial Spin Ice and Anti-Spin Ice Ni80 Fe20 Structures: Static and Dynamic Behavior (2016)
Journal Article
Zhou, X., Chua, G., Singh, N., & Adeyeye, A. O. (2016). Large Area Artificial Spin Ice and Anti-Spin Ice Ni80 Fe20 Structures: Static and Dynamic Behavior. Advanced Functional Materials, 26(9), 1437-1444. https://doi.org/10.1002/adfm.201505165

Artificial spin ice has been the subject of extensive investigation in the last few years due to advances in nanotechnology and characterization techniques. So far, most of the studies have been limited to local probe of small area magnetic elements... Read More about Large Area Artificial Spin Ice and Anti-Spin Ice Ni80 Fe20 Structures: Static and Dynamic Behavior.