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The Magnetic Properties Experiments were designed to investigate the properties of the airborne dust in the Martian atmosphere. The sum of the findings enables optimization of Permalloy for spintronic experiments.Â«Â lessĪn Update on Results from the Magnetic Properties Experiments on the Mars Exploration Rovers, Spirit and Opportunity Coercive fields and anisotropy are measured by magneto-optical Kerr magnetometry. From ferromagnetic resonance absorption spectra the saturation magnetization, the anisotropy, and the Gilbert damping parameter are determined. Transmission-electron microscopymoreÂ Â» and transmission-electron diffraction are performed to determine atomic composition, crystal structure, and morphology.

The topography is imaged by atomic-force microscopy, and the magnetic microstructure by magnetic-force microscopy. Point-contact Andreev reflection is employed to determine the spin polarization of the films. The specific resistance is determined by van der Pauw methods.

In this work, thin Permalloy films are grown by dc-magnetron sputtering on heated substrates and by thermal evaporation with subsequent annealing. Detailed knowledge of the material properties is mandatory for thorough understanding its magnetization dynamics. Permalloy (Ni) is broadly used to prepare magnetic nanostructures for high-frequency experiments where the magnetization is either excited by electrical currents or magnetic fields. Structural, magnetic, and transport properties of Permalloy for spintronic experimentsĭOE Office of Scientific and Technical Information (OSTI.GOV)

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