Peculiar spin glass phase emerging in FeCo/FePt driven via nanoconfined crystallographic distortions
Abstract We explore the existence of spin glass phase in FeCo/FePt bilayers arising due to disordered ferromagnet. The non-ergodic and highly degenerate landscape of the spin glass phase at low temperature explains the origin of complex magnetic texture in the FeCo/FePt system. Upon cooling the bilayered system, the magnetic texture undergoes spin freezing below 120 K as evident from the bifurcations in zero field cooling and field cooling magnetizations at low magnetic field as a manifestation of broken ergodicity. The uncompensated magnetic moments originating in the spin glass state result in slow time dynamics of thermoremanent magnetization. Consequently, the bilayers demonstrate an intriguing magnetic memory effect in which the magnetic state of the system could be retrieved upon isothermal ageing below 120 K after reversing the temperature cycle. Thermal treatment deteriorates the spin glass behaviour and shows a transition to strong ferromagnetic character in FeCo/FePt bilayers.
Authors
- Sheng Yun Wu (ORCID: https://orcid.org/0000-0003-2750-5431)
- S. Annapoorni (ORCID: https://orcid.org/0000-0002-6083-300X)
- Chung‐Li Dong (ORCID: https://orcid.org/0000-0002-4289-4677)
- Arun Jacob Mathew (ORCID: https://orcid.org/0000-0003-0894-5140)
- Yasuhiro Fukuma (ORCID: https://orcid.org/0000-0002-1280-1644)
- Ashish Chhaganlal Gandhi (ORCID: https://orcid.org/0000-0002-1900-8702)
- Garima Vashisht (ORCID: https://orcid.org/0000-0003-2852-6867)
- Vishnu Kumar (ORCID: https://orcid.org/0000-0001-8081-110X)
- Chi‐Liang Chen (ORCID: https://orcid.org/0000-0001-8509-0655)
- Asokan Kandasami (ORCID: https://orcid.org/0000-0002-0613-219X)
Institutions
- Tamkang University (TW)
- University of Delhi (IN)
- High Energy Accelerator Research Organization (JP)
- Jawaharlal Nehru Centre for Advanced Scientific Research (IN)
- Kyushu Institute of Technology (JP)
- National Tsing Hua University (TW)
- National Dong Hwa University (TW)
- National Synchrotron Radiation Research Center (TW)
- University of Petroleum and Energy Studies (IN)
Publication Details
- Journal
- Journal of Physics D Applied Physics
- Published
- 2024-08-13
- DOI
- https://doi.org/10.1088/1361-6463/ad6e9a
- Primary Topic
- Theoretical and Computational Physics
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Council of Scientific and Industrial Research, India
- Science and Engineering Research Board