Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 45: Nano- and Optomechanics

TT 45.4: Talk

Tuesday, March 13, 2018, 12:30–12:45, H 0110

Magnetoelasticity of CoFe thin films — •Daniel Schwienbacher^1,2,3, Matthias Pernpeintner^1,2,3, Mathias Weiler^1,2, Eric R.J Edwards⁴, Hans Nembach^4,5, Justin M. Shaw⁴, Rudolf Gross^1,2,3, and Hans Huebl^1,2,3 — ¹Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, Germany — ²Physik-Department, Technische Universität München, Germany — ³Nanosystems Initiative Munich (NIM), Germany — ⁴National Institute for Standards and Technology, Boulder, CO, USA — ⁵JILA,University of Colorado, CO, USA

Ultra-low magnetic damping materials are essential for spintronic applications. Schoen et al. [1] recently discovered ultra-low magnetic damping in a metallic CoFe thin film. Magnetoelastic properties are known to critically affect spintronic devices, however, they are difficult to quantify in thin films. Here, we use SiN nanostring resonators loaded with CoFe thin films for measuring the magnetoelastic properties and find a saturation magnetostriction coefficient of λ = (−27.2 ± 4.1 )× 10⁻⁶ for 10 nm thick Co₂₅Fe₇₅ films. This opens exciting perspectives for combining magnetoelastics with ultra-low damping materials.
Schoen et al., Nature Physics 12, 839 (2016)