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Ultra 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...
PublicationsPossible 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...
PublicationsRoom-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...
PublicationsDefect-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,...
PublicationsEvidence 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...
PublicationsThouless length and valley degeneracy factor of ZnMnO thin films with anisotropic, highly conductive surface layers
Isothermal magnetoresistance (MR) of n-type conducting Zn1–xMnxO thin films on a sapphire substrate with a Mn content of 5 at. % has been studied in in-plane and out-of-plane magnetic fields up to 6...
PublicationsTransition metal diffusion in diluted magnetic Si and GaAs prepared by pulsed laser processing
Starting from a random or ordered distribution of 0.8%, 1.6%, 3.7%, and 12.5% dopants over the lattice sites of a simple cubic grid, we estimate the fraction of unclustered dopants after pulsed laser processing...
PublicationsEffects of the TiO2 buffer thickness on SrTiO3 (111) epitaxial films grown on GaN (0002)
SrTiO3 (STO) films have been grown on TiO2-buffered GaN(0002) substrates. The deposition process was in situ monitored by reflective high energy electron diffraction (RHEED). The deposition rate and in-plane...
PublicationsAmorphous clusters in Co implanted ZnO induced by boron preimplantation
We demonstrate the formation of superparamagnetic/ferromagnetic regions within ZnO(0001) single crystals sequentially implanted with B and Co. While the preimplantation with B plays a minor role for the...
PublicationsFerromagnetic resonance on metal nanocrystals in Fe and Ni implanted ZnO
We studied the angular dependence of the ferromagnetic resonance (FMR) spectra of (0001)ZnO single crystals implanted with Ni and Fe ions and compared the results to the data obtained by other experimental...
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