Vortex dynamics and frequency splitting in vertically coupled nanomagnets
- Far Eastern Federal Univ., Vladivostok (Russia)
- Argonne National Lab. (ANL), Argonne, IL (United States); Western Digital, San Jose, CA (United States)
- Far Eastern Federal Univ., Vladivostok (Russia); National Research South Ural State Univ., Chelyabinsk (Russia)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- National Univ. of Science and Technology ("MISiS"), Moscow (Russia); National Research South Ural State Univ., Chelyabinsk (Russia)
Here, we explored the dynamic response of a vortex core in a circular nanomagnet by manipulating its dipole-dipole interaction with another vortex core confined locally on top of the nanomagnet. A clear frequency splitting is observed corresponding to the gyrofrequencies of the two vortex cores. The peak positions of the two resonance frequencies can be engineered by controlling the magnitude and direction of the external magnetic field. Both experimental and micromagnetic simulations show that the frequency spectra for the combined system is significantly dependent on the chirality of the circular nanomagnet and is asymmetric with respect to the external bias field. We attribute this result to the strong dynamic dipole-dipole interaction between the two vortex cores, which varies with the distance between them. The possibility of having multiple states in a single nanomagnet with vertical coupling could be of interest for magnetoresistive memories.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- Ministry of Education and Science of the Russian Federation; USDOE Office of Science (SC), Basic Energy Sciences (BES); Materials Sciences and Engineering Division; Russian Foundation for Basic Research
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1352925
- Journal Information:
- Scientific Reports, Vol. 7, Issue 1; ISSN 2045-2322
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Transient dynamics of strongly coupled spin vortex pairs: Effects of anharmonicity and resonant excitation on inertial switching
|
journal | May 2018 |
Effects of asymmetry in strongly coupled spin vortex pairs
|
journal | January 2019 |
Photovoltage detection of spin excitation of a ferromagnetic stripe and disk at low temperature
|
journal | January 2020 |
Similar Records
Vortex jump behavior in coupled nanomagnetic heterostructures
Magnetization reversal assisted by half antivortex states in nanostructured circular cobalt disks