Efficiency of ultrafast laser-induced demagnetization in Gd<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mi>x</mml:mi></mml:msub></mml:math>Fe<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mrow><mml:mn>100</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi><mml:mo>−</mml:mo><mml:mi>y</mml:mi></mml:mrow></mml:msub></mml:math>Co<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:ms

Medapalli, Rajasekhar; Razdolski, Ilya; Savoini, Matteo; Khorsand, A.R.; Kirilyuk, Andrei; Kimel, A.V.; Rasing, T.H.M.; Kalashnikova, A.M.; Tsukamoto, Arata; Itoh, A.

doi:10.1103/physrevb.86.054442

Cited by 33 publications

(35 citation statements)

References 29 publications

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“…2(b). The AOS fluence switching window is thus reduced above T M , and this asymmetry of the switching window around T M is consistent with the literature [13][14][15]. Part of this effect might be attributed to the proximity with the Curie temperature T C .…”

Section: B Time-resolved Dynamics Around T Msupporting

confidence: 90%

“…Among these, the exact role played by the magnetization compensation temperature T M at which the magnetizations of the two sublattices cancel each other out remains a puzzle. On the one hand, strong changes in the magnetization dynamics upon crossing T M have been observed [13][14][15], and AOS seems to occur preferably for alloys displaying a T M that can be reached through laser excitation [9,10,16]. On the other hand, atomistic simulations of the spin dynamics as well as experiments have shown that AOS is feasible below and above T M [6].…”

Section: Introductionmentioning

confidence: 99%

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Deterministic character of all-optical magnetization switching in GdFe-based ferrimagnetic alloys

Guyader¹,

Moussaoui²,

Buzzi³

et al. 2016

Phys. Rev. B

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Using photoemission electron microscopy with x-ray magnetic circular dichroism as a contrast mechanism, new insights into the all-optical magnetization switching (AOS) phenomenon in GdFe-based rare-earth transitionmetal ferrimagnetic alloys are provided. From a sequence of static images taken after single linearly polarized laser pulse excitation, the repeatability of AOS can be quantified with a correlation coefficient. It is found that low coercivity enables thermally activated domain-wall motion, limiting in turn the repeatability of the switching. Time-resolved measurements of the magnetization dynamics reveal that while AOS occurs below and above the magnetization compensation temperature T M , it is not observed in GdFe samples where T M is absent. Finally, AOS is experimentally demonstrated against an applied magnetic field of up to 180 mT.

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Section: B Time-resolved Dynamics Around T Msupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Deterministic character of all-optical magnetization switching in GdFe-based ferrimagnetic alloys

Guyader¹,

Moussaoui²,

Buzzi³

et al. 2016

Phys. Rev. B

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“…Earlier, it has been suggested, based on the studies of the ultrafast laser-induced demagnetization in GdFeCo alloys, that the angular momentum transfer from TM to RE sublattice plays an important role in the process. 40 Spatiallyand element-resolved studies of the reversal dynamics in GeFeCo have shown that there is the angular momentum transfer between Gd-rich and Fe-rich nanoscale areas in the GdFeCo sample which accompanies the reversal. 41 Recently, has been reported that there is a transfer of the angular momentum between RE and TM sublattices of the metallic ferrimagnetic alloys CoGd and CoTb induced by the action of the laser pulse and monitored by the spin-and orbital-resolved X-ray technique.…”

Section: Magnetization Reversal Induced By a Femtosecond Laser Pmentioning

confidence: 99%

Exchange scattering as the driving force for ultrafast all-optical and bias-controlled reversal in ferrimagnetic metallic structures

Kalashnikova

Козуб

2016

Phys. Rev. B

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Experimentally observed ultrafast all-optical magnetization reversal in ferrimagnetic metals and heterostructures based on antiferromagnetically coupled ferromagnetic d− and f −metallic layers relies on intricate energy and angular momentum flow between electrons, phonons and spins. Here we treat the problem of angular momentum transfer in the course of ultrafast laser-induced dynamics in a ferrimagnetic metallic system using microscopical approach based on the system of rate equations. We show that the magnetization reversal is supported by a coupling of d− and f − subsystems to delocalized s− or p− electrons. The latter can transfer spin between the two subsystems in an incoherent way owing to the (s; p) − (d; f ) exchange scattering. Since the effect of the external excitation in this process is reduced to the transient heating of the mobile electron subsystem, we also discuss possibility to trigger the magnetization reversal by applying a voltage bias pulse to antiferromagnetically coupled metallic ferromagnetic layers embedded in point contact or tunneling structures. We argue that such devices allow controlling reversal with high accuracy. We also suggest to use the anomalous Hall effect to register the reversal, thus playing a role of reading probes.

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“…The present experimental geometry at room temperature avoids laserinduced magnetization precessions 18 as well as laser-induced switching across a ferrimagnetic compensation point. [19][20][21] Rather, we are sensitive to the out-of-plane magnetization change as a result of laser-induced heating. Note that in the experiment, the magneto-optical signal of GdCo(Fe) comes mainly from the Co(Fe) 3d moments.…”

mentioning

confidence: 99%

Role of the inter-sublattice exchange coupling in short-laser-pulse-induced demagnetization dynamics of GdCo and GdCoFe alloys

et al. 2013

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The dynamics of the demagnetization induced by an ultrashort laser pulse in GdCo and GdCoFe alloys is shown to be substantially different from the expected trend. We find that the intersublattice exchange interaction between Gd and Co(Fe) is used as an additional route of heat transfer during the demagnetization process and leads to a temporary cooling of the Co(Fe) spin subsystem. The observed results are described by a four-temperature model (4T model) in which electrons, lattice, and 4f and 3d spins represent four reservoirs of heat energy. In this model, the coupling between the electron and spin reservoirs is responsible for an ultrafast demagnetization, while the intersublattice exchange coupling gives rise to an immediate remagnetization and serves as a thermal link between the Co(Fe) and Gd spins.

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Efficiency of ultrafast laser-induced demagnetization in GdxFe100−x−yCo

Cited by 33 publications

References 29 publications

Deterministic character of all-optical magnetization switching in GdFe-based ferrimagnetic alloys

Deterministic character of all-optical magnetization switching in GdFe-based ferrimagnetic alloys

Exchange scattering as the driving force for ultrafast all-optical and bias-controlled reversal in ferrimagnetic metallic structures

Role of the inter-sublattice exchange coupling in short-laser-pulse-induced demagnetization dynamics of GdCo and GdCoFe alloys

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