Nanoscale spin reversal by non-local angular momentum transfer following ultrafast laser excitation in ferrimagnetic GdFeCo

Graves, Catherine E.; Reid, Alexander H.; Wang, T.; Wu, Benny; Jong, S. de; Vahaplar, K.; Radu, Ilie; Bernstein, David P.; Messerschmidt, Marc; Müller, Leonard; Coffee, Ryan; Bionta, Mina R.; Epp, Sascha W.; Hartmann, R.; Kimmel, Nils; Hauser, Günter; Hartmann, Andreas; Holl, P.; Gorke, H.; Mentink, Johan H.; Tsukamoto, Arata; Fognini, Andreas; Turner, Joshua J.; Schlotter, W. F.; Rolles, Daniel; Soltau, H.; Strüder, L.; Acremann, Yves; Kimel, A.V.; Kirilyuk, Andrei; Rasing, T.H.M.; Stöhr, J.; Scherz, Andreas; Dürr, H. A.

doi:10.1038/nmat3597

Cited by 295 publications

(255 citation statements)

References 36 publications

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“…Moreover, coupling between Mn on different sublattices, which exhibit different magnetic moments and behavior, may have interesting dynamical effects that can be exploited for all optical switching devices, similar to recent work in GdFeCo. 40 …”

Section: Discussionmentioning

confidence: 99%

Evidence for localized moment picture in Mn-based Heusler compounds

Karel

Bernardi

Wang

et al. 2015

Phys. Chem. Chem. Phys.

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X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) were used to probe the oxidation state and element specific magnetic moments of Mn in Heusler compounds with different crystallographic structure.The results were compared with theoretical calculations, and it was found that in full Heusler alloys, Mn is metallic (oxidation state near 0) on both sublattices. The magnetic moment is large and localized when octahedrally coordinated by the main group element, consistent with previous theoretical work, and reduced when the main group coordination is tetrahedral. By contrast, in the half Heusler compounds the magnetic moment of the Mn atoms is large and the oxidation state is +1 or +2. The magnetic and electronic properties of Mn in full and half Heusler compounds are strongly dependent on the structure and sublattice, a fact that can be exploited to design new materials.

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Section: Discussionmentioning

confidence: 99%

Evidence for localized moment picture in Mn-based Heusler compounds

Karel

Bernardi

Wang

et al. 2015

Phys. Chem. Chem. Phys.

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“…3 What is this insight alike we get through experiments on ultrafast timescales? Many observations in a large number of experiments over the last years [4][5][6][7][8][9][10][11][12][13][14] reveal us different insights, and since typical electronic excitations are found on femtosecond time scales, fundamental discoveries of the solid state can be made in the femtosecond region. Femtosecond laser experiments can be compared with particle accelerator experiments in nuclear physics aiming to break the ground state into fundamental excitations.…”

Section: Introduction: Current Understanding Of Ultrafast Processesmentioning

confidence: 99%

Perspective: Ultrafast magnetism and THz spintronics

Walowski

Münzenberg

2016

Journal of Applied Physics

313

204

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This year the discovery of femtosecond demagnetization by laser pulses is 20 years old. For the first time, this milestone work by Bigot and coworkers gave insight directly into the time scales of microscopic interactions that connect the spin and electron system. While intense discussions in the field were fueled by the complexity of the processes in the past, it now became evident that it is a puzzle of many different parts. Rather than providing an overview that has been presented in previous reviews on ultrafast processes in ferromagnets, this perspective will show that with our current depth of knowledge the first applications are developed: THz spintronics and all-optical spin manipulation are becoming more and more feasible. The aim of this perspective is to point out where we can connect the different puzzle pieces of understanding gathered over 20 years to develop novel applications. Based on many observations in a large number of experiments. Differences in the theoretical models arise from the localized and delocalized nature of ferromagnetism. Transport effects are intrinsically non-local in spintronic devices and at interfaces. We review the need for multiscale modeling to address the processes starting from electronic excitation of the spin system on the picometer length scale and sub-femtosecond time scale, to spin wave generation, and towards the modeling of ultrafast phase transitions that altogether determine the response time of the ferromagnetic system. Today, our current understanding gives rise to the first usage of ultrafast spin physics for ultrafast magnetism control: THz spintronic devices. This makes the field of ultrafast spin-dynamics an emerging topic open for many researchers right now. Published by AIP Publishing. [http://dx

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“…Recently, this field has been propelled by ultrafast spin polarized [5][6][7][8][9][10] and unpolarized currents [11] generated by a gradient in excitation density [12]. These effects offer to exploit non-local magnetization dynamics.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, laser-induced spin currents in a magnetic tunnel junction were controlled by a bias voltage [14]. Moreover, spin currents are reported to drive an ultrafast change between ferri-and ferromagnetic order [10].…”

Section: Introductionmentioning

confidence: 99%

Separation of ultrafast spin currents and spin-flip scattering in Co/Cu(001) driven by femtosecond laser excitation employing the complex magneto-optical Kerr effect

et al. 2015

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Ultrafast magnetization dynamics in metallic heterostructures consists of a combination of local demagnetization in the ferromagnetic constituent and spin-dependent transport contributions within and in between the constituents. Separation of these local and non-local contributions is essential to obtain microscopic understanding and for potential applications of the underlying microscopic processes. By comparing the ultrafast changes of the polarization rotation and ellipticity in the magneto-optical Kerr effect (MOKE) we observe a time-dependent magnetization profile M (z, t) in Co/Cu(001) films by exploiting the effective depth sensitivity of the method. By analyzing the spatio-temporal correlation of these profiles we find that on time scales before hot electron thermalization (< 100 fs) the transient magnetization of Co films is governed by spin-dependent transport effects, while after hot electron thermalization (> 200 fs) local spin-flip processes dominate.

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Nanoscale spin reversal by non-local angular momentum transfer following ultrafast laser excitation in ferrimagnetic GdFeCo

Cited by 295 publications

References 36 publications

Evidence for localized moment picture in Mn-based Heusler compounds

Evidence for localized moment picture in Mn-based Heusler compounds

Perspective: Ultrafast magnetism and THz spintronics

Separation of ultrafast spin currents and spin-flip scattering in Co/Cu(001) driven by femtosecond laser excitation employing the complex magneto-optical Kerr effect

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