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Faraday's Law

Faraday's Law

Faraday's law state that the induced emf is the negative change in the magnetic flux per unit of time. Any change in the magnetic field or change in the orientation of the area of the coil with respect to the magnetic field induces a voltage (emf). The magnetic flux measures the number of magnetic field lines through a given surface area. Magnetic flux is estimated from the integral of the dot product of the magnetic field vector and the area vector. The negative sign describes the direction in...

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Updated: May 18, 2026

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

Ultrafast time-resolved faraday rotation in EuO thin films.

F Liu¹, T Makino, T Yamasaki

¹Quantum Phase Electronics Center and Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.

Physical Review Letters

|September 26, 2012

Summary

We observed transiently enhanced magnetization in Europium Oxide (EuO) thin films, driven by ultrafast spin dynamics. This enhancement, peaking near the Curie temperature, suggests a temporary collective ordering due to improved f-d exchange interactions.

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Area of Science:

Condensed matter physics
Materials science
Ultrafast spectroscopy

Background:

Europium Oxide (EuO) is a magnetic semiconductor with potential applications in spintronics.
Understanding its ultrafast spin dynamics is crucial for developing novel magnetic devices.

Purpose of the Study:

To investigate the ultrafast spin dynamics in EuO thin films.
To elucidate the mechanisms behind photoinduced magnetization changes.

Main Methods:

Time-resolved Faraday rotation spectroscopy was employed.
Measurements were conducted across a range of temperatures, particularly near the Curie temperature.

Main Results:

A transient increase in photoinduced magnetization was observed, followed by demagnetization.
Magnetization enhancement peaked below the Curie temperature, with prolonged tails at other temperatures.
The enhancement component decayed within approximately 1 nanosecond and dominated at 55 K.

Conclusions:

The observed transient collective ordering is attributed to an enhanced f-d exchange interaction.
These findings offer insights into the manipulation of magnetization in magnetic semiconductors.