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Substrate Contribution to Ultrafast Spin Dynamics in 2D van der Waals Magnets.

Mara Strungaru1, Richard F L Evans2, Roy W Chantrell2

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We developed a model to simulate ultrafast demagnetization in 2D magnets, revealing a two-step process influenced by electron behavior and substrate heating. This model accurately captures dynamics in materials like CrI3.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Ultrafast Phenomena

Background:

  • Ultrafast demagnetization dynamics in 2D magnets are crucial for next-generation spintronic devices.
  • Understanding the interplay between electron, phonon, and spin systems is key to controlling magnetic properties.
  • Existing models often lack the ability to capture complex phenomena like substrate effects.

Purpose of the Study:

  • To develop a comprehensive model for simulating type-II ultrafast demagnetization dynamics in 2D magnetic materials.
  • To investigate the influence of heated substrates on demagnetization processes.
  • To accurately reproduce experimental observations in systems like Chromium triiodide (CrI3).

Main Methods:

  • Atomistic spin dynamics coupled to an electronic thermal bath.
  • Two-temperature model (TTM) for electron and phonon heat baths.
  • Incorporation of substrate heating effects into the TTM framework.

Main Results:

  • Successfully reproduced type-II ultrafast demagnetization dynamics in a generic 2D system (CrI3).
  • Identified a two-step demagnetization process: a fast step due to quasimetallic electron behavior and a slow step from substrate heating.
  • Observed laser-induced domain formation in CrI3, consistent with experimental findings.

Conclusions:

  • The proposed generalized two-temperature model effectively describes ultrafast magnetization dynamics.
  • The model accurately captures quasimetallic behavior and substrate influence in 2D magnetic materials.
  • This framework advances the modeling of ultrafast magnetic phenomena and material behavior.