Ultrafast demagnetizing fields from first principles
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Citations
Perspective: Ultrafast magnetism and THz spintronics
Perspective on Metallic Antiferromagnets
Atomistic Spin Dynamics
Time-Dependent Magnons from First Principles.
First-principles and model simulation of all-optical spin reversal
References
The Vector Representation of Spinning Particle in the Quantum Theory, I*
Femtosecond opto-magnetism: ultrafast laser manipulation of magnetic materials
On-site approximation for spin-orbit coupling in linear combination of atomic orbitals density functional methods
Spin Currents and Spin Dynamics in Time-Dependent Density-Functional Theory
Many-Body Theory of Ultrafast Demagnetization and Angular Momentum Transfer in Ferromagnetic Transition Metals
Related Papers (5)
Theory of laser-induced demagnetization at high temperatures
Ultrafast heating as a sufficient stimulus for magnetization reversal in a ferrimagnet.
Ultrafast spin dynamics in ferromagnetic nickel.
Frequently Asked Questions (11)
Q2. What have the authors stated for future works in "Ultrafast demagnetizing fields from first principles" ?
The authors have found that clusters will demagnetize about twice as fast if the polarization vector is in the base plane and not vertical ( through the apex atoms ). During the application of the laser pulse, the rise of spin noncollinearity may be enhanced by the particular polarization direction of the laser pulse through the spin-orbit coupling and this effect combined with the collapse of the kinetic field may explain the initial spin loss.
Q3. What is the effect of the laser pulse on the spin density?
During the application of the laser pulse, the rise of spin noncollinearity may be enhanced by the particular polarization direction of the laser pulse through the spin-orbit coupling and this effect combined with the collapse of the kinetic field may explain the initial spin loss.
Q4. What is the effect of the SO enhanced by the collapse of the effective field?
The first fast decay may be attributed to the effect of the SO enhanced by the collapse of the effective field Beff following the action of the laser pulse.
Q5. What is the effect of the pulse on the spin dynamics?
Hence the long-term spin dynamics is not the result of a net charge displacement from the region close to the ions to the interstitial space.
Q6. What is the role of the effective field in the evolution of the spin vector?
The role of this field is particularly significant for processes far from equilibrium, such as the ultrafast demagnetization observed in transition metals.
Q7. Why does the laser pulse excit the currents?
This is due to the fact that the laser pulse directly excites currents, through the term −∇ · D(r,t) in Eq. (12), which in turn produces a modification of the gradients of the charge/spin density, even on a global scale since they are not conserved.
Q8. What is the result of the interplay between the SO coupling and Bkin(r,?
In both systems studied the spin dynamics is the result of the interplay between the SO coupling and Bkin(r,t), which,024412-7in general, is strongly coupled to the external pulse and highly nonuniform in space.
Q9. What is the kinetic field of Eq. 13?
By using the previous expression to rewrite the first- and second-order spatial derivatives, the kinetic field of Eq. (13) can be divided into two componentsBkin(r,t) = B0kin(r,t) + δBkin(r,t). (24)
Q10. What is the role of D(r,t) during the action of the pulse?
Similarly to the case of Fe6, the role played by ∇ · D(r,t) isdominant during the action of the pulse, but after this initial phase the dynamics is dominated by intraband transitions and the interplay between the spin-orbit coupling and the effective field Beff becomes dominant.
Q11. What is the kinetic field of the ALSDA?
In the previous sections the authors have revisited the concept of kinetic field, its derivation within DFT, and its properties as a major source of torque for the spin dynamics within the ALSDA.