K. H. J. Buschow

Bio: K. H. J. Buschow is an academic researcher. The author has contributed to research in topics: Intermetallic & Invar. The author has an hindex of 1, co-authored 1 publications receiving 239 citations.

Ferromagnetic materials : a handbook on the properties of magnetically ordered substances

Abstract: Preface. Contents of Volumes 1-4. 1. Quadrupolar interactions and magneto-elastic effects in rare-earth intermetallic compounds (P. Morin and D. Schmitt). 2. Magneto-optical spectroscopy of f-electron systems (W. Reim and J. Schoenes). 3. INVAR: Moment-volume instabilities in transition metals and alloys (E.F. Wasserman). 4. Strongly enhanced itinerant intermetallics and alloys (P.E. Brommer and J.J.M. Franse). 5. First-order magnetic processes (G. Asti). 6. Magnetic superconductors (O. Fischer). Author index. Subject index. Materials index.

Dilute magnetic semiconducting oxides

Abstract: A review of recent results on transition metal doping of electronic oxides such as ZnO, TiO2, SnO2, BaTiO3, Cu2O, SrTiO3 and KTaO3 is presented. There is interest in achieving ferromagnetism with Curie temperatures above room temperature in such materials for applications in the field of spintronic devices, in which the spin of the carriers is exploited. The incorporation of several atomic per cent of the transition metals without creation of second phases appears possible under optimized synthesis conditions, leading to ferromagnetism. Pulsed laser deposition, reactive sputtering, molecular beam epitaxy and ion implantation have all been used to produce the oxide-based dilute magnetic materials. The mechanism is still under debate, with carrier-induced, double-exchange and bound magnetic polaron formation all potentially playing a role depending on the conductivity type and level in the material.

The selection of mechanical actuators based on performance indices

Abstract: A method is presented for selecting the type of actuator best suited to a given task, in the early stages of engineering design. The selection is based on matching performance characteristics of the actuator, such as force and displacement, to the requirements of the given task. The performance characteristics are estimated from manufacturers9 data and from simple models of performance limitation such as heat generation and resonance. Characteristics are presented in a graphical form which allows for a direct and systematic comparison of widely different systems of actuation. The actuators considered include man-made actuators (such as hydraulic, solenoid and shape memory alloy) and naturally occurring actuators (such as the muscles of animals and plants).

Shape memory ferromagnets

Abstract: In ferromagnetic alloys with shape memory large reversible strains can be obtained by rearranging the martensitic domain structure by a magnetic field. Magnetization through displacement of domain walls is possible in the presence of high magnetocrystalline anisotropy, when martensitic structure rearrangement is energetically favorable compared to the reorientation of magnetic moments. In ferromagnetic Heusler alloys Ni2+xMn1–xGa the Curie temperature exceeds the martensitic transformation temperature. The fact that these two temperatures are close to room temperature offers the possibility of magnetically controlling the shape and size of ferromagnets in the martensitic state. In Ni2+xMn1–xGa single crystals, a reversible strain of ~6% is obtained in fields of ~1 T.

Progress in magnetic domain observation by advanced magneto-optical microscopy

Abstract: The observation of magnetic domains by magneto-optical microscopy, based on the Kerr and the Faraday effect, is one of the most prominent techniques for the visualization of distributions of magnetization within magnetic materials. The method has gained increased attention due to the possibility to visualize field and current induced phenomena in nanostructured magnetic materials on fast time-scales. Fundamental concepts and recent advances in methodology are discussed in order to provide guidance on the usage of wide-field magneto-optical microscopy in applied magnetism. Recent applications of magneto-optical microscopy in bulk and thin film materials are reviewed at the end.