Ab initio study of ultrafast spin dynamics in Gdx(FeCo) 1−x alloys

@article{Dewhurst2022AbIS,
  title={Ab initio study of ultrafast spin dynamics in Gdx(FeCo)
1−x alloys},
  author={J. K. Dewhurst and Sam Shallcross and Ilie Radu and Peter Elliott and C. v. Korff Schmising and S. Sharma},
  journal={Applied Physics Letters},
  year={2022}
}
Using an ultrashort laser pulse we explore ab-initio the spin dynamics of Gdx(FeCo)1−x at femtosecond time scales. Optical excitations are found to drive charge from Fe majority d-states to the unoccupied Gd f -minority states, with f -electron character excited occupation lagging behind that of the d-electron character, leading to substantial demagnetisation of both species while leaving the global moment almost unchanged. For x > 0.33 this results in the creation of an ultrafast ferromagnetic… 

Figures from this paper

References

SHOWING 1-10 OF 25 REFERENCES
Spatially resolved investigation of all optical magnetization switching in TbFe alloys
TLDR
Spatially resolved measurements in a 3–5 μm sized stationary laser spot demonstrate that all-optical helicity-dependent switching is a local phenomenon in the vicinity of thermal demagnetization in a ‘ring’ shaped region, and it is demonstrated that the thickness of the film determines the preferential switching direction for a particular helicity.
Ultrafast optical manipulation of magnetic order
The interaction of subpicosecond laser pulses with magnetically ordered materials has developed into a fascinating research topic in modern magnetism. From the discovery of subpicosecond
Transient ferromagnetic-like state mediating ultrafast reversal of antiferromagnetically coupled spins
TLDR
It is found that the ultrafast spin reversal in GdFeCo, where spins are coupled antiferromagnetically, occurs by way of a transient ferromagnetic-like state, which provides a concept for the possibility of manipulating magnetic order on the timescale of the exchange interaction.
Ultrafast optically induced spin transfer in ferromagnetic alloys
TLDR
The experimental findings are fully supported by time-dependent density functional theory simulations and suggest the possibility of coherently controlling spin dynamics on subfemtosecond time scales, i.e., the birth of the research area of attomagnetism.
All-thermal switching of amorphous Gd-Fe alloys: Analysis of structural properties and magnetization dynamics
In recent years there has been an intense interest in understanding the microscopic mechanism of thermally induced magnetization switching driven by a femtosecond laser pulse. Most of the effort has
The role of magnetization compensation point for efficient ultrafast control of magnetization in Gd24Fe66.5Co9.5 alloy
The ability of a femtosecond laser pulse to manipulate and reverse the magnetization in a ferrimagnetic Gd24Fe66.5Co9.5 thin film was studied experimentally as a function of temperature. For a fixed
Optical inter-site spin transfer probed by energy and spin-resolved transient absorption spectroscopy
TLDR
This work shows that an optical inter-site spin transfer from Pt to Co emerges as a dominant mechanism governing the ultrafast magnetization dynamics of a CoPt alloy, enabling the engineering of functional magnetic systems for future all optical technologies.
Light-wave dynamic control of magnetism
TLDR
This study unveils light-field coherent control of spin dynamics and macroscopic magnetic moments in the initial non-dissipative temporal regime and establishes optical frequencies as the speed limit of future coherent spintronic applications, spin transistors and data storage media.
Laser-Induced Intersite Spin Transfer.
TLDR
Laser pulses induce spin-selective charge flow that is universally applicable to AFM, FM, and ferri-magnets in both multilayer and bulk geometry and provide three rules that encapsulate early-time magnetization dynamics of multisub-lattice systems.
...
1
2
3
...