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      Magnetoelasticity of \(\mathrm{Co_{25}}\mathrm{Fe_{75}}\) thin films

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          Abstract

          We investigate the magnetoelastic properties of \(\mathrm{Co_{25}}\mathrm{Fe_{75}}\) and \(\mathrm{Co_{10}}\mathrm{Fe_{90}}\) thin films by measuring the mechanical properties of a doubly clamped string resonator covered with multi-layer stacks containing these films. For the magnetostrictive constants we find \(\lambda_{\mathrm{Co_{25}}\mathrm{Fe_{75}}}=(-20.68\pm0.25)\times10^{-6}\) and \(\lambda_{\mathrm{Co_{10}}\mathrm{Fe_{90}}}=(-9.80\pm0.12)\times10^{-6}\) at room temperature. In stark contrast to the positive magnetostriction previously found in bulk CoFe crystals. \(\mathrm{Co_{25}}\mathrm{Fe_{75}}\) thin films unite low damping and sizable magnetostriction and are thus a prime candidate for micromechanical magnonic applications, such as sensors and hybrid phonon-magnon systems.

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          High quality factor resonance at room temperature with nanostrings under high tensile stress

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            Current-Induced Magnetization Switching with a Spin-Polarized Scanning Tunneling Microscope

            Switching the magnetization of a magnetic bit by injection of a spin-polarized current offers the possibility for the development of innovative high-density data storage technologies. We show how individual superparamagnetic iron nanoislands with typical sizes of 100 atoms can be addressed and locally switched using a magnetic scanning probe tip, thus demonstrating current-induced magnetization reversal across a vacuum barrier combined with the ultimate resolution of spin-polarized scanning tunneling microscopy. Our technique allows us to separate and quantify three fundamental contributions involved in magnetization switching (i.e., current-induced spin torque, heating the island by the tunneling current, and Oersted field effects), thereby providing an improved understanding of the switching mechanism.
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              Multiferroic and magnetoelectric heterostructures

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                Author and article information

                Journal
                13 June 2019
                Article
                1906.05543
                b40e8f1a-4124-4970-8040-85b27e6c70f0

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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                Custom metadata
                4 pages, 4 figures, SI
                cond-mat.mes-hall cond-mat.mtrl-sci

                Condensed matter,Nanophysics
                Condensed matter, Nanophysics

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