SKM 2023 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 3: Magnetic Materials for Efficient Energy Conversion
MA 3.1: Vortrag
Montag, 27. März 2023, 09:30–09:45, HSZ 401
Voltage-driven giant modulation of magnetism in ferro- and ferri-magnetic alloys — •Xinglong Ye1,2, Harish Singh1, Hongbin Zhang1, Holger Geßwein3, Reda Chellali2, Ralf Witte2, Alan Molinari2, Konstantin Skokov1, Oliver Gutfleisch1, Horst Hahn2, and Robert Kruk2 — 1Department of Material Science, Technical University Darmstadt — 2Institute of Nanotechnology, Karlsruhe Institute of Technology — 3Institute of Applied Materials, Karlsruhe Institute of Technology
Controlling magnetism and magnetic properties by small voltages have become one of the core research topics vigorously pursued in magnetoelectric actuation, spintronics and data storage. In magnetically-ordered metals and alloys, however, the voltage effect is usually limited to the scale of atomic layers due to strong electric-field screening. Here, we propose to control their magnetism and magnetic properties by electrochemically-driven insertion/extraction of hydrogen atoms in interstitial sites. Using this approach, we have tuned the magnetocrystalline anisotropy and coercivity of SmCo5 with micrometer-sized particles by more than 1 T by applying voltages as low as 1 V. Consequently, a voltage-assisted and -controlled magnetization reversal has been achieved at room temperature for the first time in permanent magnets. Furthermore, we will show that our electrochemically-driven hydrogen charging can switch the perpendicular anisotropy to in-plane anisotropy in ferrimagnetic thin films with high anisotropy energy, which further exemplifies the universality of our approach in controlling magnetism of rare earth - containing materials.