Observation of coherently coupled cation spin dynamics in an insulating ferrimagnetic oxide
Abstract
Many technologically useful magnetic oxides are ferrimagnetic insulators, which consist of chemically distinct cations. Here, we examine the spin dynamics of different magnetic cations in ferrimagnetic NiZnAl-ferrite (Ni0.65Zn0.35Al0.8Fe1.2O4) under continuous microwave excitation. Specifically, we employ time-resolved x-ray ferromagnetic resonance to separately probe Fe2+/3+ and Ni2+ cations on different sublattice sites. Our results show that the precessing cation moments retain a rigid, collinear configuration to within ≈2°. Moreover, the effective spin relaxation is identical to within <10% for all magnetic cations in the ferrite. Thus, we validate the oft-assumed “ferromagnetic-like” dynamics in the resonantly driven ferrimagnetic oxide: the magnetic moments from different cations precess as a coherent, collective magnetization, despite the high contents of nonmagnetic Zn2+ and Al3+ diluting the exchange interactions.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 27, 2023
- Source ID
- 10.1063/5.0141869
Entities
People
- B. A. Gray
- B. M. Howe
- C. Kons
- Christoph Klewe
- Darío Arena
- E. Arenholz
- H.-m. Jeon
- J. E. Shoup
- Olof Karis
- Padraic Shafer
- R. Knut
- Satoru Emori
- Y. Pogoryelov
- Y. Suzuki
Organizations
- Advanced Light Source
- Air Force Office of Scientific Research
- Air Force Research Laboratory
- Alexander von Humboldt Foundation
- Division of Electrical, Communications & Cyber Systems
- KBR, Inc.
- Office of Science
- Stanford University
- United States Department of Defense
- University of South Florida
- Uppsala University
- Virginia Tech