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Magnetostatic Boundary Conditions

Magnetostatic Boundary Conditions

An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...

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Updated: Jun 8, 2026

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

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Accelerated Ultrafast Magnetization Dynamics at Graphene/CoGd Interfaces.

Sucheta Mondal¹, Yuxuan Lin¹, Debanjan Polley^1,2

¹Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, United States.

|June 13, 2022

Summary

This summary is machine-generated.

Graphene layers adjacent to magnetic surfaces enhance spin-orbit coupling, influencing magnetization dynamics. This study modulates ultrafast magnetization at graphene/ferrimagnet interfaces, revealing interconnected dynamical parameters and potential for advanced spintronic devices.

Keywords:

TRMOKE ferrimagnet graphene precessional dynamics spin current ultrafast demagnetization

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Area of Science:

Condensed Matter Physics
Materials Science
Spintronics

Background:

Atomically thin graphene layers exhibit spin-sink properties when interfaced with magnetic materials.
Graphene's extrinsic spin-orbit coupling (SOC) is crucial for absorbing spin angular momentum from adjacent magnetic layers.
Modulating spin dynamics at interfaces is key for developing novel spintronic devices.

Purpose of the Study:

To investigate the modulation of ultrafast magnetization dynamics at graphene/ferrimagnet interfaces.
To understand the role of graphene layers in influencing magnetic properties.
To explore the potential of graphene-ferrimagnet interfaces for future spintronic applications.

Main Methods:

Utilized the time-resolved magneto-optical Kerr effect (TRMOKE) technique.
Studied interfaces with varying numbers of graphene layers on a Co74Gd26 ferrimagnetic film.
Analyzed dynamical parameters such as demagnetization time, remagnetization times, decay time, effective damping, and precessional frequency.

Main Results:

Observed interconnected variations in ultrafast magnetization dynamics with changes in graphene layer number.
Demagnetization and decay times of the ferrimagnet were significantly faster (approximately two times) with graphene.
Identified a correlation between demagnetization time and damping, with monolayer graphene and graphite showing pronounced effects. Spin-mixing conductance was measured at approximately 0.8 × 10^15 cm^-2.

Conclusions:

Graphene significantly modifies ultrafast magnetization dynamics at ferrimagnetic interfaces.
The observed effects are attributed to SOC, pure spin current, structural defects, and thermal properties.
Graphene/ferrimagnet interfaces offer promising properties for designing high-performance spintronic devices.