Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Valence Bond Theory

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...

Atomic Nuclei: Nuclear Spin State Overview

Atomic Nuclei: Nuclear Spin State Overview

NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...

Colors and Magnetism

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...

Atomic Nuclei: Nuclear Spin State Population Distribution

Atomic Nuclei: Nuclear Spin State Population Distribution

Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.

Ferromagnetism

Ferromagnetism

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...

Atomic Nuclei: Nuclear Magnetic Moment

Atomic Nuclei: Nuclear Magnetic Moment

All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Ultrabright Near-Infrared Lead-Free Perovskite Light-Emitting Diodes with Negligible Efficiency Roll-Off.

Journal of the American Chemical Society·2026

Same author

Unconventional skyrmions in synthetic antiferromagnets.

Nature materials·2026

Same author

Electron pressure drives THz phonons in metal-metal superlattices.

Nature communications·2026

Same author

Electrocaloric effects across room temperature in multilayer capacitors.

Nature·2026

Same author

HfO<sub>2</sub>-based memristive synapses with asymmetrically extended p-n heterointerfaces for highly energy-efficient neuromorphic hardware.

Science advances·2026

Same author

Multimodal electron microscopy of halide perovskite interfacial dynamics.

Nature·2026

Search research articles

Related Experiment Video

Updated: Jun 24, 2025

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers

Published on: October 5, 2013

Ultra-high spin emission from antiferromagnetic FeRh.

Dominik Hamara¹, Mara Strungaru², Jamie R Massey^3,4,5

¹Department of Physics, University of Cambridge, Cambridge, UK.

Nature Communications

|June 11, 2024

Summary

Researchers observed significant spin current generation in antiferromagnetic iron rhodium (FeRh) using optical pulses. This effect, driven by destabilizing the spin-lattice, could lead to advanced spin current emitters.

More Related Videos

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Published on: March 24, 2019

Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures

Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures

Published on: October 9, 2012

Related Experiment Videos

Last Updated: Jun 24, 2025

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers

Published on: October 5, 2013

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Published on: March 24, 2019

Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures

Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures

Published on: October 9, 2012

Area of Science:

Condensed Matter Physics
Materials Science
Spintronics

Background:

Antiferromagnets can generate spin currents when time-reversal symmetry is broken, often via magnetic fields or optical pumping.
Understanding ultrafast spin dynamics in magnetic materials is crucial for developing next-generation electronic devices.

Purpose of the Study:

To investigate picosecond spin pumping in metallic FeRh using optical pump-THz emission spectroscopy.
To explore the influence of temperature on spin current generation in the antiferromagnetic phase of FeRh.

Main Methods:

Optical pump-THz emission spectroscopy was employed to study spin pumping dynamics.
Temperature and magnetic field-dependent measurements were combined with atomistic spin dynamics simulations.
The role of conduction electrons in spin-biasing and spin accumulation was analyzed.

Main Results:

A large and coherent spin pumping was observed in the low-temperature antiferromagnetic phase of FeRh, without transitioning to the ferromagnetic phase.
Optical pumping and picosecond spin-biasing destabilized the antiferromagnetic spin-lattice, leading to spin accumulation.
The high spin susceptibility of Rh atoms was identified as a key factor for the observed effect's amplitude.

Conclusions:

The study demonstrates a novel mechanism for generating spin currents in antiferromagnetic FeRh.
The findings suggest FeRh's potential as an efficient spin current emitter.
Results corroborate the picosecond timescale of magnetic phase transitions, often obscured by slower dynamics.