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  • 1. Bran, Cristina
    et al.
    Hudl, Matthias
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Material Physics, MF.
    Björck, Matts
    Kapaklis, Vassilios
    Andersson, Gabriella
    Magnetic Properties of Fe/WRe (001) Multilayers2014In: Journal of Surfaces and Interfaces of Materials, ISSN 2164-7542, Vol. 2, no 1, p. 33-39Article in journal (Refereed)
    Abstract [en]

    Following recent theoretical predictions on perpendicular uniaxial magnetocrystalline anisotropy in multilayers of 5 monolayers of Fe and 2 monolayers of W<sub> <i>x</i> </sub>Re<sub>100&#8211;<i>x</i> </sub> with tetragonally strained components, we have measured the magnetization and detailed atomic structure in a series of such samples with <i>x</i> = 20&#8211;80 at%. Although the achieved strain in the WRe layers is smaller than in the modelled case, we do observe a positive uniaxial magnetocrystalline anisotropy of around 0.6 MJ/m<sup>3</sup> at 40 K, after accounting for the in-plane shape anisotropy. This causes the out-of-plane saturation field to be reduced considerably compared to a pure Fe thin film, while the saturation magnetization is maintained at a value which is enhanced by at least 30% from what would be expected from the multilayer composition alone. The coercivity is low, on the order of 6 kA/m in all samples.

  • 2. Hoglin, Viktor
    et al.
    Hudl, Matthias
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Material Physics, MF. Uppsala University, Sweden .
    Caron, Luana
    Beran, Premysl
    Solby, Magnus H.
    Nordblad, Per
    Andersson, Yvonne
    Sahlberg, Martin
    Detailed study of the magnetic ordering in FeMnP0.75Si0.252015In: Journal of Solid State Chemistry, ISSN 0022-4596, E-ISSN 1095-726X, Vol. 221, p. 240-246Article in journal (Refereed)
    Abstract [en]

    Magnetic and crystallographic properties of FeMnP0.75Si0.25 in the hexagonal Fe2P-type structure have been investigated by X-ray powder diffraction, neutron powder diffraction and magnetic measurements. The room temperature diffractograms reveal co-existence of two distinct structural phases in the samples with small, but significant, differences only in the unit cell dimensions. The volume ratio between the two phases is governed by the annealing conditions. One of the phases orders ferromagnetically (T-C=250 K) and the other in an incommensurate antiferromagnetic structure at low temperatures (q(x) = 0.363(1), T-N=150 K).

  • 3.
    Hudl, Matthias
    et al.
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Material Physics, MF.
    Campanini, D.
    Caron, L.
    Hoglin, V.
    Sahlberg, M.
    Nordblad, P.
    Rydh, A.
    Thermodynamics around the first-order ferromagnetic phase transition of Fe2P single crystals2014In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 90, no 14, p. 144432-Article in journal (Refereed)
    Abstract [en]

    The specific heat and thermodynamics of Fe2P single crystals around the first-order paramagnetic to ferromagnetic (FM) phase transition at T-C similar or equal to 217 K are empirically investigated. The magnitude and direction of the magnetic field relative to the crystal axes govern the derived H-T phase diagram. Strikingly different phase contours are obtained for fields applied parallel and perpendicular to the c axis of the crystal. In parallel fields, the FM state is stabilized, while in perpendicular fields the phase transition is split into two sections, with an intermediate FM phase where there is no spontaneous magnetization along the c axis. The zero-field transition displays a textbook example of a first-order transition with different phase stability limits on heating and cooling. The results have special significance since Fe2P is the parent material to a family of compounds with outstanding magnetocaloric properties.

  • 4.
    Hudl, Matthias
    et al.
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Material Physics, MF. ETH Zürich, Switzerland.
    Lazor, Peter
    Mathieu, Roland
    Gavriliuk, Alexander
    Struzhkin, Viktor
    PPMS-based set-up for Raman and luminescence spectroscopy at high magnetic field, high pressure and low temperature2015In: EPJ Techniques and Instrumentation, ISSN 2195-7045, Vol. 2, no 1Article in journal (Refereed)
    Abstract [en]

    We present an experimental set-up permitting Raman and luminescence spectroscopy studies in a commercial Physical Properties Measurement System (PPMS) from Quantum Design. Using this experimental set-up, gaseous, liquid and solid materials, in bulk or thin film form, may be investigated. The set-up is particularly suitable for the study of the spin-lattice coupling in strongly correlated oxide materials utilizing several different stimuli, e.g. magnetic and electric fields, high pressure and low temperatures. Details for the Raman extension, sample holder assembly and optical design, as well as data acquisition and measurement routine are described. Finally, we present exemplary results collected using the set-up, measured on reference materials, as well as on a correlated transition metal oxide.

  • 5. Höglin, Viktor
    et al.
    Cedervall, Johan
    Andersson, Mikael Svante
    Sarkar, Tapati
    Hudl, Matthias
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Material Physics, MF. Uppsala University, Uppsala, Sweden.
    Nordblad, Per
    Andersson, Yvonne
    Sahlberg, Martin
    Phase diagram, structures and magnetism of the FeMnP1-xSix-system2015In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 5, no 11, p. 8278-8284Article in journal (Refereed)
    Abstract [en]

    The magnetic properties of the (Fe,Mn)(2)(P,Si)-system have been shown to be readily manipulated by small changes in composition. This study surveys the FeMnP1-xSix-system (0.00 <= x <= 1.00) reporting sample syntheses and investigations of crystallographic and magnetic properties using X-ray powder diffraction and magnetic measurements. Two single phase regions exist: the orthorhombic Co2P-type structure (x < 0.15) and the Fe2P-type structure (0.24 <= x < 0.50). Certain compositions have potential for use in magnetocaloric applications.

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