Publications (20)
Antiferromagnetic I-Mn-V semiconductors
T. Jungwirth, V. Novak, X. Marti +14
After decades of research, the low Curie temperature of ferromagnetic semiconductors remains the key problem in the development of magnetic semiconductor spintronic technologies. R…
Strain-induced nonsymmorphic symmetry breaking and removal of Dirac semimetallic nodal line in an orthoperovskite iridate
Jian Liu, D. Kriegner, L. Horak +10
By using a combination of heteroepitaxial growth, structure refinement based on synchrotron x-ray diffraction and first-principles calculations, we show that the symmetry-protected…
Critical role of the sample preparation in experiments using piezoelectric actuators inducing uniaxial or biaxial strains
D. Butkovicova, X. Marti, V. Saidl +4
We report on a systematic study of the stress transferred from an electromechanical piezo-stack into GaAs wafers under a wide variety of experimental conditions. We show that the s…
Skin layer of BiFeO3 single crystals
X. Marti, P. Ferrer, J. Herrero-Albillos +5
A surface layer ("skin") that is functionally and structurally different from the bulk was found in single crystals of BiFeO3. Impedance analysis indicates that a previously report…
Single crystal studies and electronic structure investigation of a room-temperature semiconductor NaMnAs
J. Volny, V. Holy, K. Charvatova +11
We report synthesis of single crystalline NaMnAs, confirm its antiferromagnetic order and characterise the sample by photoemission spectroscopy. The electronic structure was studie…
Solving and refining novel thin film phases using Cu X-ray radiation: the epitaxy-induced CuMnAs tetragonal phase
P. Wadley, A. Crespi, J. Gazquez +10
We present a combined experimental and computational method which enables the precise determination of the atomic positions in a thin film using CuKα radiation, only. The capabili…
Tetragonal phase of epitaxial room-temperature antiferromagnet CuMnAs
P. Wadley, V. Novák, R. P. Campion +20
Recent studies have demonstrated the potential of antiferromagnets as the active component in spintronic devices. This is in contrast to their current passive role as pinning layer…
Controlled aggregation of magnetic ions in a semiconductor. Experimental demonstration
A. Bonanni, A. Navarro-Quezada, Tian Li +8
The control on the distribution of magnetic ions into a semiconducting host is crucial for the functionality of magnetically doped semiconductors. Through a structural analysis at…
Suppression of ferromagnetism in van der Waals insulator due to pressure-induced layer stacking variation
M. Misek, U. Dutta, P. Kral +15
Ferromagnetism in van der Waals insulators like CrBr3 is highly sensitive to structural modifications. We explore the pressure-driven structural and magnetic transformations of the…
X-ray interference effects on the determination of structural data in ultrathin La2/3Sr1/3MnO3 epitaxial thin films
D. Pesquera, R. Bachelet, G. Herranz +3
We analyze X-ray diffraction data used to extract cell parameters of ultrathin films on closely matching substrates. We focus on epitaxial La2/3Sr1/3MnO3 films grown on (001) SrTiO…
Selective coherent x-ray diffractive imaging of displacement fields in (Ga,Mn)As/GaAs periodical wires
A. A. Minkevich, E. Fohtung, T. Slobodskyy +7
Coherent x-ray diffractive imaging is extended to high resolution strain analysis in crystalline nanostructured devices. The application potential is demonstrated by determining th…
Molecular Beam Epitaxy of LiMnAs
V. Novak, M. Cukr, Z. Soban +5
We report on the molecular beam epitaxy (MBE) growth of high crystalline quality LiMnAs. The introduction of a group-I alkali metal element Li with flux comparable to fluxes of Mn…
Structural and magnetic evidence of confined strain fields in GaMnAs grown on ordered arrays of zero-dimensional nanostructures
X. Marti, T. Cechal, L. Horak +5
We prepared Ga0.95Mn0.05As films on top of periodic arrays of InAs quantum dots. X-ray diffraction reveals periodically strained films, commensurate to substrate's patterning. The…
Tunneling anisotropic magnetoresistance of NiFe/IrMn/MgO/Pt stack: An antiferromagnet based spin-valve
B. G. Park, J. Wunderlich, X. Marti +9
Spin-valve is a microelectronic device in which high and low resistance states are realized by utilizing both charge and spin of carriers. Spin-valve structures used in modern hard…
K-edge XANES of substitutional and interstitial Mn atoms in (Ga,Mn)As
N. A. Goncharuk, L. Smrcka, J. Kucera +5
This work reports theoretical and experimental study of the X-ray absorption near-edge structure (XANES) at the Mn K-edge in (Ga,Mn)As diluted magnetic semiconductors. The spectra…
Topological insulator homojunctions including magnetic layers: the example of n-p type (-QLs BiSe/Mn-BiSe) heterostructures
M. Valiska, J. Warmuth, M. Michiardi +9
Homojunctions between BiSe and its Mn-doped phase are investigated as a sample geometry to study the influence of spin degrees of freedom on topological insulator propertie…
Multiple-stable anisotropic magnetoresistance memory in antiferromagnetic MnTe
D. Kriegner, K. Vyborny, K. Olejnik +10
A common perception assumes that magnetic memories require ferromagnetic materials with a non-zero net magnetic moment. However, it has been recently proposed that compensated anti…
Surface morphology and magnetic anisotropy in (Ga,Mn)As
S. Piano, X. Marti, A. W. Rushforth +6
Atomic Force Microscopy and Grazing incidence X-ray diffraction measurements have revealed the presence of ripples aligned along the direction on the surface of (Ga,M…
Mn incorporation in as-grown and annealed (Ga,Mn)As layers studied by x-ray diffraction and standing-wave uorescence
V. Holy, Z. Matej, O. Pacherova +4
A combination of high-resolution x-ray diffraction and a new technique of x-ray standing wave uorescence at grazing incidence is employed to study the structure of (Ga,Mn)As dilute…
Magnetocrystalline anisotropy controlled local magnetic configurations in (Ga,Mn)As spin-transfer-torque microdevices
J. Wunderlich, A. C. Irvine, J. Zemen +11
The large saturation magnetization in conventional dense moment ferromagnets offers flexible means of manipulating the ordered state through demagnetizing shape anisotropy fields b…