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Magnetic properties and Curie temperatures of disordered Heusler compounds: Co(1+x)Fe(2-x)Si
Julia Erika Fischer, Julie Karel, Simone Fabbrici +5
The local atomic environments and magnetic properties were investigated for a series of Co(1+x)Fe(2-x)Si (0<x<1) Heusler compounds. While the total magnetic moment in these compoun…
Evidence for Localized Moment Picture in Mn-based Heusler Compounds
J. Karel, F. Bernardi, C. Wang +7
X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) were used to probe the oxidation state and element specific magnetic moments of Mn in Heusler compo…
High thermoelectric figure of merit in p-type Half-Heuslers by intrinsic phase separation
Elisabeth Rausch, Siham Ouardi, Ulrich Burkhardt +3
Improvements in the thermoelectric properties of Half-Heusler materials have been achieved by means of a micrometer-scale phase separation that increases the phonon scattering and…
Long-term stability of phase-separated Half-Heusler compounds
Julia Krez, Benjamin Balke, Claudia Felser +2
Half-Heusler (HH) compounds have shown high Figure of merits up to 1.5. The key to these high thermoelectric efficiencies is an intrinsic phase separation, which occurs in multicom…
Direct measurement of the magnetic anisotropy field in Mn--Ga and Mn--Co--Ga Heusler films
Ciarán Fowley, Siham Ouardi, Takahide Kubota +10
The static and dynamic magnetic properties of tetragonally distorted Mn--Ga based alloys were investigated. Static properties are determined in magnetic fields up to 6.5~T using SQ…
State of Co and Mn in half-metallic ferromagnet CoMnSi explored by magnetic circular dichroism in hard X-ray photoelectron emission and soft X-ray absorption spectroscopies
Gerhard H. Fecher, Daniel Ebke, Siham Ouardi +8
The half-metallic Heusler compound CoMnSi is a very attractive material for spintronic devices because it exhibits very high tunnelling magnetoresistance ratios. This work repo…
Magnetic dichroism study on MnCoGa thin film using a combination of X-ray absorption and photoemission spectroscopy
Siham Ouardi, Gerhard H. Fecher, Takahide Kubota +4
Using circularly polarised radiation and a combination of bulk-sensitive hard X-ray photoelectron spectroscopy and X-ray-absorption spectroscopy (XAS) we studied the electronic and…
Evidence of surface transport and weak anti-localization in single crystal of Bi2Te2Se topological insulator
Chandra Shekhar, C. E. Viol Barbosa, Binghai Yan +4
Topological insulators are known to their metallic surface states, a result of strong-spin-orbital coupling, that show unique surface transport phenomenon. But these surface transp…
Investigation on MnGa/MgO interface for magnetic tunneling junctions
C. E. ViolBarbosa, S. Ouardi, T. Kubota +6
The MnGa Heusler compound and related alloys are the most promising materials for the realization of spin-transfer-torque switching in magneto tunneling junctions. Improved per…
Magnetic and transport properties of tetragonal- or cubic-Heusler-type Co-substituted Mn-Ga epitaxial thin films
Takahide Kubota, Siham Ouardi, Shigemi Mizukami +4
The composition dependence of the structural, magnetic, and transport properties of epitaxially grown Mn-Co-Ga films were investigated. The crystal structure was observed to change…
Perpendicularly magnetized Mn-Co-Ga-based thin films with high coercive field
Siham Ouardi, Takahide Kubota, Gerhard H. Fecher +5
MnCoGa epitaxial thin films were grown on MgO substrates by magnetron co-sputtering. Structures were tetragonal or cubic depending on Co content. Composition dependen…
Magnetic dichroism in angular resolved hard X-ray photoelectron spectroscopy from buried magnetic layers
Carlos E. ViolBarbosa, Siham Ouardi, Gerhard H. Fecher +2
This work reports on the measurement of magnetic dichroism in angular-resolved photoelectron spectroscopy from in-plane magnetized buried thin films. The high bulk sensitivity of h…
Realization of spin gapless semiconductors: the Heusler compound Mn2CoAl
Siham Ouardi, Gerhard H. Fecher, Jürgen Kübler +1
Recent studies have reported an interesting class of semiconductor materials that bridge the gap between semiconductors and halfmetallic ferromagnets. These materials, called spin…
Hard X-ray photoelectron spectroscopy on buried, off-stoichiometric CoxMnyGez (x : z = 2 : 0.38) Heusler thin films
Siham Ouardi, Gerhard H. Fecher, Stanislav Chadov +5
Fully epitaxial magnetic tunnel junctions (MTJs) with off-stoichiometric Co2-based Heusler alloy shows a intense dependency of the tunnel magnetoresistance (TMR) on the Mn composit…
Electronic and crystalline structures of zero band-gap PdLuBi thin films grown epitaxially on MgO(100)
Rong Shan, Siham Ouardi, Gerhard H. Fecher +8
Thin films of the proposed topological insulator PdLuBi - a Heusler compound with the C1b structure - were prepared on Ta-Mo-buffered MgO(100) substrates by co-sputtering from PdBi…
A p-type Heusler compound: Growth, structure, and properties of epitaxial thin NiYBi films on MgO(100)
Rong Shan, Siham Ouardi, Gerhard H. Fecher +7
Epitaxial semiconducting NiYBi thin films were directly prepared on MgO(100) substrates by magnetron sputtering. The intensity ratio of the (200) and (400) diffraction peaks, I(200…
Electronic structure and symmetry of valence states of epitaxial NiTiSn and NiZrHfSn thin films by hard x-ray photoelectron spectroscopy
Xeniya Kozina, Tino Jaeger, Siham Ouardi +7
The electronic band structure of thin films and superlattices made of Heusler compounds with NiTiSn and NiZrHfSn composition was studied by means of polarization de…
Magnetic dichroism in angular-resolved hard X-ray photoelectron spectroscopy from buried layers
Xeniya Kozina, Gerhard H. Fecher, Gregory Stryganyuk +15
This work reports the measurement of magnetic dichroism in angular-resolved photoemission from in-plane magnetized buried thin films. The high bulk sensitivity of hard X-ray photoe…
Seebeck coefficients of half-metallic ferromagnets
Benjamin Balke, Siham Ouardi, Tanja Graf +6
In this report the Co2 based Heusler compounds are discussed as potential materials for spin voltage generation. The compounds were synthesized by arcmelting and consequent anneali…
High energy, high resolution photoelectron spectroscopy of Co2Mn(1-x)Fe(x)Si
Gerhard H. Fecher, Benjamin Balke, Siham Ouardi +5
This work reports on high resolution photoelectron spectroscopy for the valence band of Co2Mn(1-x)Fe(x)Si (x=0,0.5,1) excited by photons of about 8 keV energy. The measurements sho…