Hot-Electron-Driven Enhancement of Spin-Lattice Coupling in Gd and Tb<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>4</mml:mn><mml:mi>f</mml:mi></mml:math>Ferromagnets Observed by Femtosecond X-Ray Magnetic Circular Dichroism

Wietstruk, Marko; Melnikov, Alexey; Stamm, C.; Kachel, T.; Pontius, N.; Sultan, Muhammad; Gahl, Cornelius; Weinelt, Martin; Dürr, H. A.; Bovensiepen, Uwe

doi:10.1103/physrevlett.106.127401

Cited by 169 publications

(209 citation statements)

References 33 publications

(47 reference statements)

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“…Even though the two sublattices are exchange coupled, they still demagnetize at different rates as in their pure ferromagnetic form 17,18 . This non-equivalence of the sublattices is essential for the reversal, requiring different rates of demagnetization in each sublattice.…”

Section: Discussionmentioning

confidence: 99%

Ultrafast heating as a sufficient stimulus for magnetization reversal in a ferrimagnet

et al. 2012

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The question of how, and how fast, magnetization can be reversed is a topic of great practical interest for the manipulation and storage of magnetic information. It is generally accepted that magnetization reversal should be driven by a stimulus represented by time-non-invariant vectors such as a magnetic field, spin-polarized electric current, or cross-product of two oscillating electric fields. However, until now it has been generally assumed that heating alone, not represented as a vector at all, cannot result in a deterministic reversal of magnetization, although it may assist this process. Here we show numerically and demonstrate experimentally a novel mechanism of deterministic magnetization reversal in a ferrimagnet driven by an ultrafast heating of the medium resulting from the absorption of a sub-picosecond laser pulse without the presence of a magnetic field.

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Section: Discussionmentioning

confidence: 99%

Ultrafast heating as a sufficient stimulus for magnetization reversal in a ferrimagnet

et al. 2012

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“…One indication of this effect has been found by Erekhinsky et al [45] in a transport experiment. Another indication is the fact, that for gadolinium, the surface demagnetizes within <100 fs (measured by second harmonic magneto-optical Kerr effect [46]), whereas the bulk needs approx. 1 ps [47].…”

Section: The Role Of the Interface For The Demagnetizationmentioning

confidence: 99%

Laser-induced ultrafast spin current pulses: a thermodynamic approach

Fognini

Michlmayr

Vaterlaus

et al. 2017

J. Phys.: Condens. Matter

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“…13,[37][38][39][40][41][42] In ferrimagnets, there is a large interest on demagnetization rates of each species, following the use of X-ray magnetic circular dichroism 5 to monitor the sub-picosecond dynamics of each sublattice magnetization individually. 4 Thermal effects dominate the magnetization dynamics during the heating produced by the laser.…”

Section: Estimation Of the Temperature Dependent Magnetization Relmentioning

confidence: 99%

Controlling the polarity of the transient ferromagneticlike state in ferrimagnets

et al. 2014

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It was recently observed that the two antiferromagnetically coupled sublattices of a rare earth-transition metal ferrimagnet can temporarily align ferromagnetically during femtosecond laser heating, but always with the transition metal aligning in the rare earth direction. This behavior has been attributed to the slower magnetization dynamics of the rare earth sublattice. The aim of this work was to assess how the difference in the speed of the transition metal and rare earth dynamics affects the formation of the transient ferromagnetic-like state and consequently controls its formation. Our investigation was performed using extensive atomistic spin simulations and analytic micromagnetic theory of ferrimagnets, with analysis of a large area of parameter space such as initial temperature, Gd concentration and laser fluence. Surprisingly, we found that at high temperatures, close to the Curie point, the rare earth dynamics become faster than those of the transition metal. Subsequently we show that the transient state can be formed with the opposite polarity, where the rare earth aligns in the transition metal direction. Our findings shed light on the complex behavior of this class of ferrimagnetic materials and highlight an important feature which must be considered, or even exploited, if these materials are to be used in ultrafast magnetic devices.

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Hot-Electron-Driven Enhancement of Spin-Lattice Coupling in Gd and Tb4fFerromagnets Observed by Femtosecond X-Ray Magnetic Circular Dichroism

Cited by 169 publications

References 33 publications

Ultrafast heating as a sufficient stimulus for magnetization reversal in a ferrimagnet

Ultrafast heating as a sufficient stimulus for magnetization reversal in a ferrimagnet

Laser-induced ultrafast spin current pulses: a thermodynamic approach

Controlling the polarity of the transient ferromagneticlike state in ferrimagnets

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