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Tunability of domain structure and magnonic spectra in antidot arrays of Heusler alloy

DOI: 10.1103/PhysRevApplied.12.014043 DOI Help

Authors: Sougata Mallick (National Institute of Science Education and Research, HBNI) , Sucheta Mondal (S. N. Bose National Centre for Basic Sciences) , Takeshi Seki (Tohoku University) , Sourav Sahoo (S. N. Bose National Centre for Basic Sciences) , Thomas Forrest (Diamond Light Source) , Francesco Maccherozzi (Diamond Light Source) , Zhenchao Wen (Tohoku University) , Saswati Barman , Anjan Barman (S. N. Bose National Centre for Basic Sciences) , Koki Takanashi (Tohoku University) , Subhankar Bedanta (National Institute of Science Education and Research, HBNI)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review Applied , VOL 12

State: Published (Approved)
Published: July 2019
Diamond Proposal Number(s): 16582

Abstract: Materials suitable for magnonic crystals demand low magnetic damping and long spin-wave 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 Co 2 Fe 0.4 Mn 0.6 Si Heusler-alloy thin films are prepared using e-beam lithography and sputtering technique. Magneto-optic Kerr effect (MOKE) and ferromagnetic resonance analysis confirm the presence of dominant cubic and moderate uniaxial magnetic anisotropies in the thin film. Domain imaging via x-ray photoemission electron microscopy on the antidot arrays reveals chainlike switching or correlated bigger domains for different antidot shapes. Time-resolved MOKE microscopy is 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.

Journal Keywords: Magnetic anisotropy; Magnonic crystals; Spin waves; Spintronics; Ultrafast magnetization dynamics; Heusler alloy; Nanostructures; Thin films

Subject Areas: Materials, Physics


Instruments: I06-Nanoscience

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