Broadband terahertz probes of anisotropic magnetoresistance disentangle extrinsic and intrinsic contributions

Nádvorník, Lukáš; Borchert, Martin; Brandt, Liane; Schlitz, Richard; de Mare, Koen A.; Výborný, Karel; Mertig, Ingrid; Jakob, Gerhard; Kläui, Matthias; Goennenwein, Sebastian T. B.

Broadband terahertz probes of anisotropic magnetoresistance disentangle extrinsic and intrinsic contributions

Dateien

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Datum

2021

Autor:innen

Nádvorník, Lukáš

Borchert, Martin

Brandt, Liane

Schlitz, Richard

de Mare, Koen A.

Výborný, Karel

Mertig, Ingrid

Jakob, Gerhard

Kläui, Matthias

Goennenwein, Sebastian T. B.

et al.

Open Access-Veröffentlichung

Open Access Gold

Sammlungen

Physik

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Physical Review X. American Physical Society (APS). 2021, 11(2), 021030. eISSN 2160-3308. Available under: doi: 10.1103/PhysRevX.11.021030

Zusammenfassung

Anisotropic magnetoresistance (AMR) is a ubiquitous and versatile probe of magnetic order in contemporary spintronics research. Its origins are usually ascribed to extrinsic effects (i.e. spin-dependent electron scattering), whereas intrinsic (i.e. scattering-independent) contributions are neglected. Here, we measure AMR of polycrystalline thin films of the standard ferromagnets Co, Ni, Ni₈₁Fe₁₉ and Ni₅₀Fe₅₀ over the frequency range from DC to 28 THz. The large bandwidth covers the regimes of both diffusive and ballistic intraband electron transport and, thus, allows us to separate extrinsic and intrinsic AMR components. Analysis of the THz response based on Boltzmann transport theory reveals that the AMR of the Ni, Ni₈₁Fe₁₉ and Ni₅₀Fe₅₀ samples is of predominantly extrinsic nature. However, the Co thin film exhibits a sizeable intrinsic AMR contribution, which is constant up to 28 THz and amounts to more than 2/3 of the DC AMR contrast of 1%. These features are attributed to the hexagonal structure of the Co crystallites. They are interesting for applications in terahertz spintronics and terahertz photonics. Our results show that broadband terahertz electromagnetic pulses provide new and contact-free insights into magneto-transport phenomena of standard magnetic thin films on ultrafast time scales.

Fachgebiet (DDC)

530 Physik

Zitieren

ISO 690

NÁDVORNÍK, Lukáš, Martin BORCHERT, Liane BRANDT, Richard SCHLITZ, Koen A. DE MARE, Karel VÝBORNÝ, Ingrid MERTIG, Gerhard JAKOB, Matthias KLÄUI, Sebastian T. B. GOENNENWEIN, 2021. Broadband terahertz probes of anisotropic magnetoresistance disentangle extrinsic and intrinsic contributions. In: Physical Review X. American Physical Society (APS). 2021, 11(2), 021030. eISSN 2160-3308. Available under: doi: 10.1103/PhysRevX.11.021030

BibTex

@article{Nadvornik2021Broad-54204,
  year={2021},
  doi={10.1103/PhysRevX.11.021030},
  title={Broadband terahertz probes of anisotropic magnetoresistance disentangle extrinsic and intrinsic contributions},
  number={2},
  volume={11},
  journal={Physical Review X},
  author={Nádvorník, Lukáš and Borchert, Martin and Brandt, Liane and Schlitz, Richard and de Mare, Koen A. and Výborný, Karel and Mertig, Ingrid and Jakob, Gerhard and Kläui, Matthias and Goennenwein, Sebastian T. B.},
  note={Article Number: 021030}
}

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