Detection of coherent magnons via ultrafast pump-probe reflectance spectroscopy in multiferroic Ba0.6Sr1.4Zn2Fe12O22

TL;DR

This study demonstrates the detection of coherent magnon modes in a multiferroic material using ultrafast pump-probe reflectance spectroscopy, highlighting a new method to probe magnetization dynamics with potential spintronics applications.

Contribution

The paper introduces a novel use of time-resolved reflectance spectroscopy to detect magnetic resonance modes in multiferroics, revealing dynamic magnetoelectric effects.

Findings

Magnetic sublattice precession was coherently excited.

Transient reflectance effectively probes magnetization dynamics.

The method shows potential for ultrafast magnetic manipulation.

Abstract

We report the detection of a magnetic resonance mode in multiferroic Ba0.6Sr1.4Zn2Fe12O22 using time domain pump-probe reflectance spectroscopy. Magnetic sublattice precession is coherently excited via picosecond thermal modification of the exchange energy. Importantly, this precession is recorded as a change in reflectance caused by the dynamic magnetoelectric effect. Thus, transient reflectance provides a sensitive probe of magnetization dynamics in materials with strong magnetoelectric coupling, such as multiferroics, revealing new possibilities for application in spintronics and ultrafast manipulation of magnetic moments.