Publications by authors named "O Karis"

Article Synopsis
  • MAX IV Laboratory is a cutting-edge synchrotron radiation facility in Sweden featuring three accelerators, including the world's first fourth-generation 3 GeV storage ring.
  • The facility uses a multibend achromat lattice, enabling it to produce ultrahigh brightness X-rays for advanced research.
  • With 16 beamlines, MAX IV supports diverse scientific inquiries through modern X-ray techniques, focusing on addressing significant societal challenges for its Nordic and Baltic user community.
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We quantify the presence of spin-mixed states in ferromagnetic 3D transition metals by precise measurement of the orbital moment. While central to phenomena such as Elliot-Yafet scattering, quantification of the spin-mixing parameter has hitherto been confined to theoretical calculations. We demonstrate that this information is also available by experimental means.

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Strained materials can exhibit drastically modified physical properties in comparison to their fully relaxed analogues. We report on the x-ray absorption spectra (XAS) and magnetic circular dichroism (XMCD) of a strained NiFeOinverse spinel film grown on a symmetry matched single crystal MgGaOsubstrate. The Ni XAS spectra exhibit a sizable difference in the white line intensity for measurements with the x-ray electric field parallel to the film plane (normal incidence) vs when the electric field is at an angle (off-normal).

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The coexistence of charge density wave (CDW) and superconductivity in tantalum disulfide (2H-TaS_{2}) at low temperature is boosted by applying hydrostatic pressures to study both vibrational and magnetic transport properties. Around P_{c}, we observe a superconducting dome with a maximum superconducting transition temperature T_{c}=9.1  K.

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Establishing ultimate spin current efficiency in graphene over industry-standard substrates can facilitate research and development exploration of spin current functions and spin sensing. At the same time, it can resolve core issues in spin relaxation physics while addressing the skepticism of graphene's practicality for planar spintronic applications. In this work, we reveal an exceptionally long spin communication capability of 45 μm and highest to date spin diffusion length of 13.

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