Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 12: Magnetization Dynamics and Damping
MA 12.4: Talk
Tuesday, March 18, 2025, 10:15–10:30, H19
Tunable magnetic easy axis orientation with ion irradiation — •Gabriel Gray1, Kilian Lenz1, Alexandra Lindner1, Jürgen Lindner1, Jürgen Faßbender1, Fabian Ganss1, Rodolfo Gallardo2, and Pedro Landeros2 — 1Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Material Research, Dresden, Germany — 2Universidad Técnica Federico Santa María, Department of Physics, Valparaíso, Chile
Our research focuses on the ion-irradiation-induced changes in magneto-crystalline anisotropy and exchange coupling in epitaxially grown Fe thin films in the (110) orientation under ultra-high vacuum conditions on GaAs (110) single crystals. A Cr capping layer was deposited to prevent oxidation. The samples were irradiated with Cr ions at varying kinetic energies and fluences. Subsequent magnetic characterizations were performed using Ferromagnetic Resonance and Vibrating Sample Magnetometry techniques, while structural characterizations where perform using X-ray Diffractometry and Transmission Electron Microscopy.
Our results reveal a clear correlation between ion fluence and modifications in uniaxial magneto-crystalline anisotropy, while cubic anisotropy and the effective magnetization remain largely unaffected. Notably, the observed changes are sufficient to induce a reorientation of the easy axis of magnetization in the system.
Keywords: Magnetization Dynamics; Thin Films; Ferromagnetic Resonance; Ion Irradiation