Influence of Ga+ milling on the spin waves modes in a Co2MnSi Heusler magnonic crystal

Mantion, S.; Biziere, Nicolas

doi:10.1063/5.0085623

Cited by 5 publications

(3 citation statements)

References 77 publications

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“…In our previous studies, we have shown that multilayer ADLs with perpendicular magnetic anisotropy (PMA) have the potential to be promising patterned systems with periodic magnetization texture to control SW propagation 35 – 37 . Micromagnetic simulations were used to interpret time-resolved magneto-optical Kerr effect microscopy measurements of SW spectra in ADLs based on [Co/Pd] 8 multilayers 35 .…”

Section: Introductionmentioning

confidence: 99%

The role of non-uniform magnetization texture for magnon–magnon coupling in an antidot lattice

Moalic,

Zelent,

Szulc

et al. 2024

Sci Rep

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We numerically study the spin-wave dynamics in an antidot lattice based on a Co/Pd multilayer structure with reduced perpendicular magnetic anisotropy at the edges of the antidots. This structure forms a magnonic crystal with a periodic antidot pattern and a periodic magnetization configuration consisting of out-of-plane magnetized bulk and in-plane magnetized rims. Our results show a different behavior of spin waves in the bulk and in the rims under varying out-of-plane external magnetic field strength, revealing complex spin-wave spectra and hybridizations between the modes of these two subsystems. A particularly strong magnon–magnon coupling, due to exchange interactions, is found between the fundamental bulk spin-wave mode and the second-order radial rim modes. However, the dynamical coupling between the spin-wave modes at low frequencies, involving the first-order radial rim modes, is masked by the changes in the static magnetization at the bulk–rim interface with magnetic field changes. The study expands the horizons of magnonic-crystal research by combining periodic structural patterning and non-collinear magnetization texture to achieve strong magnon–magnon coupling, highlighting the significant role of exchange interactions in the hybridization.

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Section: Introductionmentioning

confidence: 99%

The role of non-uniform magnetization texture for magnon–magnon coupling in an antidot lattice

Moalic,

Zelent,

Szulc

et al. 2024

Sci Rep

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“…In recent studies, ADL based on multilayers with perpendicular magnetic anisotropy (PMA) has been indicated as a patterned system hosting periodic magnetization texture with interesting properties and potential applications. [22,24,18] The results of time-resolved magneto-optical Kerr effect (TR-MOKE) microscopy measurements of SW excitations in ADL based on [Co/Pd] 8 multilayers were interpreted with micromagnetic simulations. [22] To explain low frequency mode in the spectra, the authors assumed that around the holes there is a rim with modified magnetic properties formed during the patterning process, i.e., Ga ions used in focused ion beam (FIB) in the patterning process penetrate larger area than the antidots.…”

Section: Introductionmentioning

confidence: 99%

Spin-wave spectra in antidot lattice with inhomogeneous perpendicular magnetic anisotropy

Moalic

Krawczyk

Zelent

2022

Journal of Applied Physics

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Magnonic crystals are structures with periodically varied magnetic properties that are used to control collective spin-wave excitations. With micromagnetic simulations, we study spin-wave spectra in a 2D antidot lattice based on a multilayered thin film with perpendicular magnetic anisotropy (PMA). We show that the modification of the PMA near the antidot edges introduces interesting changes to the spin-wave spectra, even in a fully saturated state. In particular, the spectra split into two types of excitations: bulk modes with amplitude concentrated in a homogeneous part of the antidot lattice and edge modes with an amplitude localized in the rims of reduced PMA at the antidot edges. Their dependence on the geometrical or material parameters is distinct, but at resonance conditions fulfilled, we found strong hybridization between bulk and radial edge modes. Interestingly, the hybridization between the fundamental modes in bulk and rim is of magnetostatic origin, but the exchange interactions determine the coupling between higher-order radial rim modes and the fundamental bulk mode of the antidot lattice.

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“…Additionally, I. Abdallah et al explored the effects of 150 keV He + irradiation on 40 nm Co2MnSi thin films as a substitute for annealing to induce B2 order, noting a reduction in magnetization with increasing fluence, and later, they reported structural effects as well [193]- [195]. Further relevant studies are cited in references [196]- [199].…”

Section: Modification In Ferromagnetic Thin Films and Multilayer Stacksmentioning

confidence: 99%

Defect Engineering Of Perpendicular Magnetic Anisotropy In Cobalt-Based Thin Films

Mahendra

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Magnetic sensors have widespread applications in industrial, security, space, and biomedical fields, offering precise measurement of magnetic fields using principles like the Hall effect and magnetoresistance. Magnetic tunnel junctions (MTJs) have played a pivotal role in advancing magnetic sensing through tunnelling magnetoresistance (TMR), contributing to spintronic devices, memory systems, and magnetic sensors. The magnetic anisotropy of the reference ferromagnetic layer in MTJ sensors is a critical factor, influencing sensitivity, accuracy, and sensing direction. Perpendicular magnetic anisotropy (PMA) is particularly advantageous for detecting magnetic fields perpendicular to the sensor plane, opening possibilities in non-destructive testing and magnetic read heads. However, conventional sensors are restricted to fixed axes, hindering their ability to measure fields in three dimensions. To address this limitation, this thesis proposes a magnetic sensor with a tuneable sensing axis, enabling comprehensive field detection in all axes. As part of this exploration, the thesis investigates ion irradiation as a post-processing technique to modify the PMA of ferromagnetic layers, offering versatility for various applications.Cobalt-based materials, especially CoFeB, are well-known for their suitability in MTJs due to high TMR with MgO and PMA at low thicknesses. Half-metallic Heusler alloys, like Co2MnGa, have gained attention for their theoretically infinite TMR, high spin polarization, and high PMA. This research assesses the effects of ion irradiation on ultra-thin Co2MnGa and CoFeB stacks with PMA.Ion irradiation is a versatile tool for precisely tailoring magnetic stack properties with uniformity and reproducibility. This thesis investigates the impact of 30 keV Ar and Ne ion irradiation on CoFeB and Co2MnGa thin film stacks at low fluences (1 × 1013 to 1 × 1015 ion·cm−2), introducing displacement per atom (DPA) as a predictive parameter for ion-induced magnetic property changes. Results show a consistent reduction in PMA for both materials in half-MTJ stacks after irradiation, which is linked to intermixing of the magnetic layer with its adjacent MgO and heavy metal layers. Ar irradiation has a more pronounced effect due to higher DPA, while Ne irradiation has a milder impact. Co2MnGa displays relatively more resilience to irradiation due to reduced intermixing with adjacent layers, compared to CoFeB. Furthermore, the thesis explores the dynamic tuning of magnetic properties through ionic liquid gating, allowing anisotropy and coercivity manipulation via voltage control. It also delves into ion irradiation's potential to enhance the magneto-ionic effect. Lastly, a novel magnetic sensor design is introduced featuring a tuneable sensing axis, enabling three-dimensional detection capabilities.

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Influence of Ga+ milling on the spin waves modes in a Co2MnSi Heusler magnonic crystal

Cited by 5 publications

References 77 publications

The role of non-uniform magnetization texture for magnon–magnon coupling in an antidot lattice

The role of non-uniform magnetization texture for magnon–magnon coupling in an antidot lattice

Spin-wave spectra in antidot lattice with inhomogeneous perpendicular magnetic anisotropy

Defect Engineering Of Perpendicular Magnetic Anisotropy In Cobalt-Based Thin Films

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