Strong momentum-dependent electron–magnon renormalization of a surface resonance on iron

Andres, Beatrice; Weinelt, Martin; Ebert, H.; Braun, Jürgen; Aperis, Alex; Oppeneer, Peter M.

doi:10.1063/5.0089688

Cited by 3 publications

(2 citation statements)

References 57 publications

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“…In an attempt to further corroborate the spin transport from the Gd to the Fe layer, we have reversed the layer order and prepared an Fe/Gd/W(110) bilayer (see Materials and Methods). In a recent static photoemission study with a 6.3-eV laser pulse, we have identified an occupied spin-mixed surface resonance SR # sm with spin minority character on Fe/W(110) (50). We now used this resonance of the body-centered cubic (bcc) Fe(110) surface to study spin transport in the reversed bilayer via time-resolved photoemission with 1.57-eV pump and 6.3-eV probe pulses.…”

Section: Resultsmentioning

confidence: 97%

Microscopic insights to spin transport–driven ultrafast magnetization dynamics in a Gd/Fe bilayer

2023

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Laser-induced spin transport is a key ingredient in ultrafast spin dynamics. However, it remains debated to what extent ultrafast magnetization dynamics generates spin currents and vice versa. We use time- and spin-resolved photoemission spectroscopy to study an antiferromagnetically coupled Gd/Fe bilayer, a prototype system for all-optical switching. Spin transport leads to an ultrafast drop of the spin polarization at the Gd surface, demonstrating angular-momentum transfer over several nanometers. Thereby, Fe acts as spin filter, absorbing spin majority but reflecting spin minority electrons. Spin transport from Gd to Fe was corroborated by an ultrafast increase of the Fe spin polarization in a reversed Fe/Gd bilayer. In contrast, for a pure Gd film, spin transport into the tungsten substrate can be neglected, as spin polarization stays constant. Our results suggest that ultrafast spin transport drives the magnetization dynamics in Gd/Fe and reveal microscopic insights into ultrafast spin dynamics.

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Section: Resultsmentioning

confidence: 97%

Microscopic insights to spin transport–driven ultrafast magnetization dynamics in a Gd/Fe bilayer

2023

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“…For the experimental study of many-body interactions with electrons, angle-resolved photoemission spectroscopy (ARPES) is the tool of choice as the complete, complex selfenergy can be extracted from the measured electronic band structures [19][20][21][22][23]. While EPC has been extensively studied using ARPES, there are only a handful of reports of electronmagnon couplings (EMC) available [24][25][26][27][28][29][30][31]. The majority of these consider couplings only in specific electron bands or over small subregions of reciprocal space.…”

Section: Introductionmentioning

confidence: 99%

Disentangling electron-boson interactions on the surface of a familiar ferromagnet

Røst,

Mazzola,

Bakkelund

et al. 2024

Phys. Rev. B

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We report energy renormalizations from electron-phonon and electron-magnon interactions in spin minority surface resonances on Ni(111). The different interactions are identified, disentangled, and quantified from the characteristic signatures they provide to the complex self-energy and the largely different binding energies at which they occur. The observed electron-magnon interactions exhibit a strong dependence on momentum and the electron energy band position in the bulk Brillouin zone. In contrast, electron-phonon interactions observed from the same bands appear to be relatively momentum and symmetry independent. Additionally, a moderately strong (λ > 0.5) electron-phonon interaction is distinguished from a near-parabolic spin majority band not crossing the Fermi level.

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Ultrafast and terahertz spintronics: Guest editorial

Kampfrath

Kirilyuk

Mangin

et al. 2023

Applied Physics Letters

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Spin-based electronics (spintronics) aims at extending electronic functionalities, which rely on the electron charge as information carrier, by the spin of the electron. To make spintronics competitive and compatible with other information carriers like photons and electrons, their speed needs to be pushed to femtosecond time scales and, thus, terahertz frequencies. In ultrafast and terahertz spintronics, femtosecond optical and terahertz electromagnetic pulses are used to induce spin torque and spin transport and to monitor the subsequent time evolution. The two approaches, sometimes referred to as femto-magnetism and terahertz magnetism, have provided new, surprising, and relevant insight as well as applications for spintronics. Examples include the ultrafast optical switching of magnetic order and the generation of broadband terahertz electromagnetic fields. This APL Special Topic Collection is dedicated to provide a platform for the newest developments and future trends in the very active, dynamic, and exciting research field of ultrafast and terahertz spintronics.

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Strong momentum-dependent electron–magnon renormalization of a surface resonance on iron

Cited by 3 publications

References 57 publications

Microscopic insights to spin transport–driven ultrafast magnetization dynamics in a Gd/Fe bilayer

Microscopic insights to spin transport–driven ultrafast magnetization dynamics in a Gd/Fe bilayer

Disentangling electron-boson interactions on the surface of a familiar ferromagnet

Ultrafast and terahertz spintronics: Guest editorial

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