Tunability of Domain Structure and Magnonic Spectra in Antidot Arrays of Heusler Alloy

Abstract

Materials suitable for magnonic crystals demand low magnetic damping and long spin wave (SW) propagation distance. In this context Co based Heusler compounds are ideal candidates for magnonic based applications. In this work, antidot arrays (with different shapes) of epitaxial Co2Fe0.4Mn0.6Si (CFMS) Heusler alloy thin films have been prepared using e-beam lithography and sputtering technique. Magneto-optic Kerr effect and ferromagnetic resonance analysis have confirmed the presence of dominant cubic and moderate uniaxial magnetic anisotropies in the thin films. Domain imaging via x-ray photoemission electron microscopy on the antidot arrays reveals chain like switching or correlated bigger domains for different shape of the antidots. Time-resolved MOKE microscopy has been performed to study the precessional dynamics and magnonic modes of the antidots with different shapes. We show that the optically induced spin-wave spectra in such antidot arrays can be tuned by changing the shape of the holes. The variation in internal field profiles, pinning energy barrier, and anisotropy modifies the spin-wave spectra dramatically within the antidot arrays with different shapes. We further show that by combining the magnetocrystalline anisotropy with the shape anisotropy, an extra degree of freedom can be achieved to control the magnonic modes in such antidot lattices. arXiv:1907.02746v1 [cond-mat.mtrl-sci]

Preparation and Magneto-Structural Investigation of Nanocrystalline CoMn-Based Heusler Alloy Glass-Coated Microwires

“…Many physical properties of bulk Heusler alloys can be tailored and improved by miniaturization as described elsewhere [22][23][24][25]. However, preparation of all perspective "multifunctional and smart" Heusler alloys faces several problems and challenges.…”

Magnetization dynamics of nanoscale magnetic materials: A perspective

“…Bragg diffraction of SW from ADL and ensuing MBG 116 , high-symmetry magnonic modes in perpendicularly magnetized ADL 117 , and complete MBG for magnetostatic forward volume waves in 2D ADL 118 . Subsequently external and internal control of SW modes in ADL started by varying lattice constant 119 , antidot shape 120 , lattice symmetry 121 , base material 122,123 , bias field strength and orientation 114,124 . Furthermore, several interesting phenomena such as mode conversion 125 , mode crossover and mode hopping 126 , mode softening 127 , as well as the formation of magnonic mini band 128 have been reported.…”

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

“…It also presents a high spin polarization (above 90% experimentally) [16][17][18][19][20][21] allowing interesting magnon spintronic devices [22][23][24] . However, to our knowledge, only few magnonics studies 10,11,[25][26][27][28] have been performed up to now with such materials and few Co-based Heusler alloy magnonic crystals exist in the literature 29,30 .…”

“…PLEASE CITE THIS ARTICLE AS DOI: 10.1063/5.0085623 beam lithography and ion milling 29,46 , deep ultraviolet lithography and lift-off 33,47 , Focused Ion Beam (FIB) [48][49][50][51] or template synthesis in porous membranes 52 . Among them, Ga + FIB milling is widely used because it is a fast direct writing technique into a magnetic thin film.…”