Magnetic response of FeRh to static and dynamic disorder

Benedikt Eggert, Alexander Schmeink, Johanna Lill, Maciej Liedke, Ulrich Kentsch, Maik Butterling, Andreas Wagner, Sakura Pascarelli, Kay Potzger, Jurgen Lindner, Thomas Thomson, Jurgen Fassbender, Katharina Ollefs, Werner Keune, Rantej Bali, Heiko Wende

Research output: Contribution to journalArticlepeer-review


Atomic scale defects generated using focused ion as well as laser beams can activate ferromagnetism in initially non-ferromagnetic B2 ordered alloy thin film templates. Such defects can be induced locally, confining the ferromagnetic objects within well-defined nanoscale regions. The characterization of these atomic scale defects is challenging, and the mechanism for the emergence of ferromagnetism due to sensitive lattice disordering is unclear. Here we directly probe a variety of microscopic defects in systematically disordered B2 FeRh thin films that are initially antiferromagnetic and undergo a thermally-driven isostructural phase transition to a volatile ferromagnetic state. We show that the presence of static disorder i.e., the slight deviations of atoms from their equilibrium sites is sufficient to induce a non-volatile ferromagnetic state at
room temperature. A static mean square relative displacement of 9x10-4 °A-2 is associated with the occurrence of non-volatile ferromagnetism and replicates a snapshot of the dynamic disorder observed in the thermally-driven ferromagnetic state. The equivalence of static and dynamic disorder with respect to the ferromagnetic behavior can provide insights into the emergence of ferromagnetic coupling as well as achieving tunable magnetic properties through defect manipulations in alloys.
Original languageEnglish
Pages (from-to)14386 - 14395
Number of pages10
JournalRSC Advances
Publication statusPublished - 7 Apr 2020


Dive into the research topics of 'Magnetic response of FeRh to static and dynamic disorder'. Together they form a unique fingerprint.

Cite this