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Tailoring the magnetism of GaMnAs films by ion irradiation
Ion irradiation of semiconductors is a well-understood method to tune the carrier concentration in a controlled manner. We show that the ferromagnetism in GaMnAs films, known to be hole-mediated, can be...
PublikationenSpin polarization in Zn0.95 Co0.05O:(Al,Cu) thin films
ZnCoO : Al, ZnCoO : (Al,Cu), and reference samples without Co have been grown by pulsed laser deposition to investigate the influence of Co-dopants and Cu-codopants on the magneto transport properties...
PublikationenRoom temperature ferromagnetism in Nd- and Mn-codoped ZnO films
Nd and Mn were codoped into ZnO films which have been grown on a-plane sapphire substrates by pulsed laser deposition with the thickness ranging between 46 and 971 nm. The room temperature resistivity...
PublikationenParamagnetism in Co-doped ZnO films
Co-doped ZnO films with various electron concentrations up to 4.61 × 1019 cm−3 at room temperature were prepared by pulsed laser deposition on a-plane sapphire substrates. Only paramagnetism was observed...
PublikationenFerroelectric and flexible barrier resistive switching of epitaxial BiFeO3 films studied by temperature-dependent current and capacitance spectroscopy
The resistive switching of epitaxial ferroelectric BiFeO3 thin films was investigated by the combined current and capacitance spectroscopy, in addition with the piezoresponse force microscopy and conducting...
PublikationenUltra large coercivity in barium ferrite thin films prepared by magnetron sputtering
Hexagonal barium ferrites were deposited onto sapphire substrates by radio frequency magnetron sputtering. The composition, microstructure, and magnetic properties of these isotropic thin films were investigated...
PublikationenPossible pitfalls in search of magnetic order in thin films deposited on single crystalline sapphire substrates
We have studied the field and temperature dependence of the magnetic moment of single crystalline sapphire substrates with different surface orientations. All the substrates show a ferromagnetic behavior...
PublikationenRoom-temperature ferromagnetic Mn-alloyed ZnO films obtained by pulsed laser desposition
Ferromagnetic, semi-insulating Mn-alloyed ZnO films with a Curie temperature above 375K have been grown by pulsed laser deposition on c-plane sapphire substrates. Antiferromagnetic coupling is revealed...
PublikationenDefect-induced ferromagnetism in crystalline SrTiO3
In this work it is shown that ion irradiation of high-quality SrTiO3 single crystals can lead to room-temperature ferromagnetism. Structural analysis revealed a polycrystalline SrTiO3 layer, Sr2Ti6O13,...
PublikationenEvidence for self-organized formation of logarithmic spirals during explosive crystallization of amorphous Ge:Mn layers
Logarithmic spirals are found on different length scales in nature, e.g., in nautilus shells, cyclones, and galaxies. The underlying formation laws can be related to different growth mechanisms, pressure...
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