Tailoring the microwave properties of thin Permalloy films using a periodically grooved substrate

• Published in: Physica. B, Condensed matter Condensed matter, 2022-03, Vol.629, p.413654, Article 413654
• Main Authors: Izotov, A.V., Belyaev, B.A., Boev, N.M., Burmitskikh, A.V., Leksikov, A.A., Skomorokhov, G.V., Solovev, P.N.
• Format: Article
• Language: English
• Subjects: Anisotropy; Damping; Damping parameter; Diamonds; Ferromagnetic resonance; Ferromagnetism; Ferrous alloys; Grooves; Induced magnetic anisotropy; Magnetic alloys; Magnetic fields; Magnetic films; Magnetic properties; Magnetism; Mathematical analysis; Netzelmann approach; Patterned film; Production methods; Substrates; Tensors; Thick films; Thin films; Topography; Topography-induced anisotropy
• ISSN: 0921-4526; 1873-2135
• DOI: 10.1016/j.physb.2021.413654

Thin magnetic films with periodic surface topography are of special interest for microwave applications as their static and dynamic magnetic characteristics can be readily adjusted. In this paper, we explore the capabilities of a simple method for producing large-area periodically patterned films by creating regularly spaced grooves on a substrate using a diamond cutter. For 110-nm-thick films, it was found that the substrate-topography-induced magnetic anisotropy was inversely proportional to the pattern period, which in experimental samples varied from 5 to 20 μm. Based on the Netzelmann theory, analytical expressions for demagnetization tensor components were obtained, which accord well with the experimental data. The measurements of the natural ferromagnetic resonance spectra demonstrated that the increase of the topography-induced magnetic anisotropy with the decrease of the pattern period led to the increase of the resonance frequency from 0.65 to 1.86 GHz, and to a decrease of the linewidth and effective damping parameter. •A simple technique to fabricate parallel microgrooves on substrates was used.•Grooved substrates transform the properties of permalloy films deposited on them.•The grooves period controls magnetic anisotropy and ferromagnetic resonance frequency.•The Netzelmann approach was used to calculate magnetic anisotropy of grooved films.•The grooves also control the magnetization damping parameter.