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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...

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Harmonic Nanoparticles for Regenerative Research

Harmonic Nanoparticles for Regenerative Research

Published on: May 1, 2014

Generating high-order optical and spin harmonics from ferromagnetic monolayers.

G P Zhang¹, M S Si², M Murakami³

¹Department of Physics, Indiana State University, Terre Haute, IN, 47809, USA. gpzhang.physics@gmail.com.

Nature Communications

|August 4, 2018

Summary

We demonstrate high-order harmonic generation (HHG) in ferromagnetic monolayers, revealing spin information and band structure mapping capabilities. This opens a new frontier in magneto-high-order harmonic generation for magnetic storage technologies.

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Area of Science:

Condensed matter physics
Materials science
Quantum optics

Background:

High-order harmonic generation (HHG) is a key process for ultrafast spectroscopy and exploring electronic band structures in solids.
Research has focused on non-magnetic materials, overlooking the potential of magnetic systems for advanced applications.
Magnetic materials offer unique spin properties that could be harnessed for novel HHG phenomena.

Purpose of the Study:

To introduce and demonstrate high-order harmonic generation (HHG) in ferromagnetic monolayers.
To investigate the spin-related properties and potential for band structure mapping using HHG in these magnetic systems.
To explore the influence of spin-orbit coupling and crystal momentum on HHG signals.

Main Methods:

Experimental generation and detection of high-order harmonics from ferromagnetic monolayers.
Theoretical analysis of spin-dependent HHG mechanisms.
Investigation of the role of spin-orbit coupling and crystal momentum (k-space) in HHG spectra.
Characterization of the dependence of HHG on monolayer orientation and symmetry.

Main Results:

Successful demonstration of HHG in ferromagnetic monolayers.
HHG signals were found to carry spin information and depend sensitively on spin-orbit coupling.
k-resolved HHG enabled mapping of band structure information from real transitions.
Even-order harmonics were observed, attributed to SU(2) symmetry, indicating spin HHG.

Conclusions:

Ferromagnetic monolayers are viable platforms for high-order harmonic generation.
Spin-resolved HHG provides a novel pathway for probing magnetic properties and band structures.
This work establishes magneto-high-order harmonic generation as a new research frontier with potential for magnetic storage technologies.