Determination of the saturation magnetization of ion irradiated Py/Ta samples using polar magneto-optical Kerr effect and ferromagnetic resonance

Markó, D.; Strache, Thomas; Lenz, K.; Faßbender, J.; Kaltofen, R.

doi:10.1063/1.3291051

Cited by 14 publications

(7 citation statements)

References 15 publications

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“…Using the approach shown in Ref. 21, the same magnetization values are found by polar magneto-optical Kerr effect measurements on equally implanted Ni 81 Fe 19 films. Furthermore, the decrease in the BLS signal in the implanted region (solid lines) with respect to the unchanged stripe regions (dotted lines) indicates an increase in the damping constant α in accordance to Ref.…”

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confidence: 62%

Microscopic magnetic structuring of a spin-wave waveguide by ion implantation in a Ni81Fe19 layer

Obry

Meyer

Pirro

et al. 2013

Applied Physics Letters

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We investigate the spin-wave excitation in microscopic waveguides fabricated by localized Cr + ion implantation in a ferromagnetic Ni 81 Fe 19 film. We demonstrate that spin-wave waveguides can be conveniently made by this technique. The magnetic patterning technique yields an increased damping and a reduction in saturation magnetization in the implanted regions that can be extracted from Brillouin light scattering measurements of the spin-wave excitation spectra. Furthermore, the waveguide performance as well as the internal field of the waveguide depend on the doping fluence. The results prove that localized ion implantation is a powerful tool for the patterning of magnon spintronic devices.The field of spin dynamics and spintronics has greatly benefited from micro-and nanopatterning techniques. The advancement of research on small magnetic structures 1-4 strongly depends on the possibility to fabricate structures of accurate sizes and shapes. Based on these developments, the focus of many investigation has turned to the realization of spin logic devices, which use the electron spin 5 or spin waves as information carrier. [6][7][8] In order to establish a pure spin-wave logic architecture, there is a need for spin-wave conduits for the transport of spin information between the individual logic devices. Thus, the fabrication and investigation of spinwave waveguides 9-12 has become a major research topic in the field of magnon spintronics. Currently, spin-wave waveguides with nanometer thicknesses and widths of several micrometers are fabricated by topographically patterning thin magnetic stripes onto a substrate that is usually nonmagnetic. However, the potential of other waveguide fabrication techniques have not been explored up to now, although they might contribute to an improvement of waveguide properties that were not accessible so far, such as, e.g., the inhomogeneity of the internal magnetic field. 13 In that respect, ion implantation of ferromagnetic films is a promising technique for the fabrication of thin films with microscopic magnetic substructures. [14][15][16] The different components contributing to the change in the magnetic properties due to Cr + ion implantation in Ni 81 Fe 19 films have been thoroughly investigated. 17 In this letter a purely magnetic microscopic structuring of spin-wave waveguides by localized ion implantation in a Ni 81 Fe 19 film is presented. We have designed a stripe shaped area with unchanged magnetic properties, embedded in a film with a reduced saturation magnetization M S and an increased damping α. It is shown that the spinwave distribution within the stripe has similar proper-FIG. 1. (Color online) Schematic sample setup. A Ni81Fe19 film with a thickness of 20 nm is grown on top of a Si/SiO2 substrate. By localized implantation of Cr + ions the magnetic properties of the implanted parts of the film are changed while a shielded region yields a 2 µm wide Ni81Fe19 stripe with unchanged properties embedded in the film. A subsequently produced Cu microwave antenna serve...

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supporting

confidence: 62%

Microscopic magnetic structuring of a spin-wave waveguide by ion implantation in a Ni81Fe19 layer

Obry

Meyer

Pirro

et al. 2013

Applied Physics Letters

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“…1). The subsequent irradiation of the sample by a broad beam of Cr + ions with a kinetic energy of 30 keV and a fluence of 4.4 • 10 15 ions/cm 2 re- sulted in a decrease of M S in the unshielded regions to (93 ± 6)% of its original value, as determined from polar magneto-optic Kerr effect measurements 22 on equally treated reference samples. Finally, a 200 nm thick and 600 nm wide Cu antenna was produced on top of the waveguides (Fig.…”

mentioning

confidence: 89%

A micro-structured ion-implanted magnonic crystal

Obry¹,

Pirro²,

Brächer³

et al. 2013

Applied Physics Letters

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We investigate spin-wave propagation in a microstructured magnonic-crystal waveguide fabricated by localized ion implantation. The irradiation caused a periodic variation in the saturation magnetization along the waveguide. As a consequence, the spin-wave transmission spectrum exhibits a set of frequency bands, where spin-wave propagation is suppressed. A weak modification of the saturation magnetization by 7% is sufficient to decrease the spin-wave transmission in the band gaps by a factor of 10. These results evidence the applicability of localized ion implantation for the fabrication of efficient micron-and nano-sized magnonic crystals for magnon spintronic applications.Magnonic crystals belong to the class of metamaterials and are artificially patterned magnetic media. This manufactured periodic pattern results in the formation of forbidden frequency bands for spin-wave excitations of the material.

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“…The saturation magnetization (M s ) values of the single-layer films were deduced from the perpendicular H s , neglecting intrinsic perpendicular anisotropy contributions. 37 A planar hard axis magnetization reversal loop was used to estimate the intrinsic uniaxial in-plane anisotropy constant (K u ) via…”

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confidence: 99%

Control of vortex pair states by post-deposition interlayer exchange coupling modification

et al. 2012

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We report on both the global and micromagnetic properties of interlayer exchange coupled spin systems. Irradiation with Ne ions is employed to achieve a phase transition from antiferromagnetic to ferromagnetic coupling. For extended trilayer films a full quantitative analysis of the bilinear and biquadratic coupling constants is performed. With increasing ion fluence we observe a steady increase of the bilinear coupling constant at an almost negligible decrease in saturation magnetization. The mixing of atoms at the layer interfaces is identified as the origin for this. The effects of ion modification on the magnetic microstructure are studied for the model system of layered vortex pairs. X-ray microscopy is used to directly image the individual magnetization circulations in trilayer disks. The circulation configuration is found to be determined by the film coupling for both coupling orientations with a homogenous coupling angle throughout the structure. For the vortex cores, however, micromagnetic simulations indicate that due to the significant local demagnetization fields, parallel states are always energetically preferred. Nevertheless antiparallel configurations are metastable, having their signature in reduced core diameters. Our study provides new results on spin structures in interlayer exchange coupled trilayers and it demonstrates a promising way to control the local interlayer coupling post-deposition.

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Determination of the saturation magnetization of ion irradiated Py/Ta samples using polar magneto-optical Kerr effect and ferromagnetic resonance

Cited by 14 publications

References 15 publications

Microscopic magnetic structuring of a spin-wave waveguide by ion implantation in a Ni81Fe19 layer

Microscopic magnetic structuring of a spin-wave waveguide by ion implantation in a Ni81Fe19 layer

A micro-structured ion-implanted magnonic crystal

Control of vortex pair states by post-deposition interlayer exchange coupling modification

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