Optimal Control of Magnetization Reversal in a Monodomain Particle by Means of Applied Magnetic Field

Kwiatkowski, Grzegorz; Badarneh, Mohammad; Berkov, D. V.; Bessarab, Pavel F.

doi:10.1103/physrevlett.126.177206

Cited by 5 publications

(5 citation statements)

References 45 publications

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“…Together with the shortest switching time and improved energy efficiency, the ideal ratio of the SOT coefficients provides particularly simple switching protocol. Indeed, the Euler-Lagrange equation describing the OCP simplifies significantly and becomes identical to that derived for the magnetic field-induced switching [35]. The optimal switching pulse gets simpler as well.…”

mentioning

confidence: 92%

“…To find the optimal switching current j m (t) that makes Φ minimum, we follow the paradigm we applied earlier to the magnetization reversal induced by applied magnetic field [35]: The energy cost is first expressed in terms of the switching trajectory and then minimized so as to find the OCPs for the switching process; After that, the optimal switching pulse j m (t) is derived from the OCPs. Qualitative difference between the field torque and SOT makes these calculations significantly more involved compared to Ref.…”

mentioning

confidence: 99%

“…Qualitative difference between the field torque and SOT makes these calculations significantly more involved compared to Ref. [35].…”

mentioning

confidence: 99%

“…only into the motion which is relevant for switching. Such a rational use of an external stimulus can always be achieved for the optimal magnetization reversal induced by applied magnetic field [35] via the adjustment of all three components of the field.…”

mentioning

confidence: 99%

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Optimal protocol for spin-orbit torque switching of a perpendicular nanomagnet

Vlasov,

Kwiatkowski,

Lobanov

et al. 2022

Preprint

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It is demonstrated by means of the optimal control theory that the energy cost of the spin-orbit torque induced reversal of a nanomagnet with perpendicular anisotropy can be strongly reduced by proper shaping of both in-plane components of the current pulse. The time-dependence of the optimal switching pulse that minimizes the energy cost associated with Joule heating is derived analytically in terms of the required reversal time and material properties. The optimal reversal time providing a tradeoff between the switching speed and energy efficiency is obtained. A sweet-spot balance between the field-like and damping-like components of the spin-orbit torque is discovered; it permits for a particularly efficient switching by a down-chirped rotating current pulse whose duration does not need to be adjusted precisely.

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confidence: 92%

mentioning

confidence: 99%

“…Qualitative difference between the field torque and SOT makes these calculations significantly more involved compared to Ref. [35].…”

mentioning

confidence: 99%

mentioning

confidence: 99%

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Optimal protocol for spin-orbit torque switching of a perpendicular nanomagnet

Vlasov,

Kwiatkowski,

Lobanov

et al. 2022

Preprint

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“…This illustrates, thus, the switching mechanisms of the systems, which turn out to depend on the semiaxis aspect of the ellipses. Noteworthy is that the most effective switching is an involved issue even in the simplest cases of permanently monodomain particles (macrospins) [36].…”

Section: Introductionmentioning

confidence: 99%

Competing Magnetocrystalline and Shape Anisotropy in Thin Nanoparticles

Kuźma,

Pastukh,

Zieliński

2024

Crystals

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Micromagnetic computations were performed to predict the magnetisation maps in thin elliptically shaped nanoparticles under a variable external magnetic field. Two materials were compared as the constituents of the nanoparticles: permalloy as an example of an isotropic magnet and cobalt, i.e., a hard magnetic material marked with a single easy axis. The interplay of the shape and magnetocrystalline anisotropy gives rise to a variety of switching scenarios, which may be of interest in designing memory storage devices. A fairly periodic shape-induced superlattice-like spin configuration occurs when the shape and magnetocrystalline easy axes are orthogonal. Possible applications as magnonic devices are discussed.

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