Nanotechnology Now

Our NanoNews Digest Sponsors
Heifer International



Home > Press > Scientists take control of magnetism at the microscopic level: Neutrons reveal remarkable atomic behavior in thermoelectric materials for more efficient conversion of heat into electricity

The sample (gray) has no applied magnetic field and has left-handed (left inset) and right-handed (right inset) magnetic domain walls. When magnetized (red), the sample’s domain walls move closer together and either annihilate or combine (bottom inset).
CREDIT
Image courtesy of Oak Ridge National Laboratory.
The sample (gray) has no applied magnetic field and has left-handed (left inset) and right-handed (right inset) magnetic domain walls. When magnetized (red), the sample’s domain walls move closer together and either annihilate or combine (bottom inset). CREDIT Image courtesy of Oak Ridge National Laboratory.

Abstract:
The Science
Atoms in magnetic materials are organized into regions called magnetic domains. Within each domain, the electrons have the same magnetic orientation. This means their spins point in the same direction. “Walls” separate the magnetic domains. One type of wall has spin rotations that are left- or right-handed, known as having chirality. When subjected to a magnetic field, chiral domain walls approach one another, shrinking the magnetic domains. Researchers have developed a magnetic material whose thickness determines whether chiral domain walls have the same or alternating handedness. In the latter case, applying a magnetic field leads to annihilation of colliding domain walls. The researchers combined neutron scattering and electron microscopy to characterize these internal, microscopic features, leading to better understanding of the magnetic behavior.

Scientists take control of magnetism at the microscopic level: Neutrons reveal remarkable atomic behavior in thermoelectric materials for more efficient conversion of heat into electricity

Washington, DC | Posted on August 26th, 2022

The Impact
An emerging field of technology called spintronics involves processing and storing information by harnessing an electron’s spin instead of its charge. The ability to control this fundamental property could unlock new possibilities for developing electronic devices. Compared to current technology, these devices could store more information in less space and operate at higher speeds with less energy consumption. This study demonstrates a way to change the rotational direction and occurrence of domain wall pairs. This suggests a potential route for controlling domain walls’ properties and movement. The results could have implications for technologies based on spintronics.

Summary
The ability to manipulate domain wall movement has remained a challenge because typically magnetic domains can randomly switch orientations. In addition, domain boundaries move unpredictably when domain sizes are reduced to accommodate higher information storage density. However, a class of materials called chiral magnets has shown potential for mitigating random domain wall behavior. This is because chiral magnets exhibit intricate spin structures, which help reduce the random reversal of domains.

Researchers from Indiana University–Purdue University Indianapolis, Oak Ridge National Laboratory, Louisiana State University, Norfolk State University, the Peter Grünberg Institute, and the University of Louisiana at Lafayette developed a chiral magnetic material by inserting manganese atoms between hexagonal layers of niobium disulfide compounds. By performing neutron experiments at the High Flux Isotope Reactor (HFIR), the team was able to analyze the magnetic nanostructure of the material when subjected to different temperatures and magnetic fields. These measurements were combined with characterization via Lorentz transmission electron microscopy, allowing a more complete understanding of the magnetic behavior. The team’s data suggest that changing the thickness of the chiral magnet can cause some domain wall pairs to rotate in opposite directions, known as having opposite chirality. Furthermore, the researchers found that domain walls with opposite chirality will move toward each other and annihilate when exposed to an external magnetic field. The findings could inform future research on controlling magnetic properties for technological applications.



Funding
The research was supported by the Department of Energy (DOE) Established Program to Stimulate Competitive Research, the National Science Foundation, the European Research Council, the German Research Foundation, and the Louisiana Board of Regents. Research was performed at High Flux Isotope Reactor at Oak Ridge National Laboratory, a DOE Office of Science user facility.

####

For more information, please click here

Contacts:
Michael Church
DOE/US Department of Energy

Office: 2028416299

Copyright © DOE/US Department of Energy

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Drawing data in nanometer scale September 30th, 2022

Researchers unveil mystery inside Li- o2 batteries September 30th, 2022

Synthesis of air-stable room-temperature van der Waals magnetic thin flakes September 30th, 2022

ACM Research Launches New Furnace Tool for Thermal Atomic Layer Deposition to Support Advanced Semiconductor Manufacturing Requirements: Ultra Fn A Furnace Tool Shipped to China-Based Foundry Customer September 30th, 2022

Display technology/LEDs/SS Lighting/OLEDs

Research improves upon conventional LED displays: With new technology, LEDs can be more cost-efficient and last longer September 9th, 2022

‘Life-like’ lasers can self-organise, adapt their structure, and cooperate July 15th, 2022

Photoinduced large polaron transport and dynamics in organic-inorganic hybrid lead halide perovskite with terahertz probes July 8th, 2022

Newly developed technique to improve quantum dots color conversion performance: Researchers created perovskite quantum dot microarrays to achieve better results in full-color light-emitting devices and expand potential applications June 10th, 2022

Magnetism/Magnons

‘Nanomagnetic’ computing can provide low-energy AI, researchers show May 6th, 2022

'Frustrated' nanomagnets order themselves through disorder: Interactions between alternating layers of exotic, 2D material create 'entropy-driven order' in a structured system of magnets at equilibrium April 8th, 2022

Tuning the bonds of paired quantum particles to create dissipationless flow: A tunable platform made from atomically thin materials may help researchers figure out how to create a robust quantum condensate that can flow without losing energy January 14th, 2022

Terahertz light-driven spin-lattice control: A new potential path to faster and more efficient data storage January 7th, 2022

Govt.-Legislation/Regulation/Funding/Policy

Drawing data in nanometer scale September 30th, 2022

New technique allows researchers to scrape beyond the surface of nanomaterials: Using a new secondary-ion mass spectrometry technique, research are getting a fresh look at MXenes and MAX phases September 23rd, 2022

Solvent study solves solar cell durability puzzle: Rice-led project could make perovskite cells ready for prime time September 23rd, 2022

Heat-resistant nanophotonic material could help turn heat into electricity: The key to beating the heat is degrading the materials in advance September 23rd, 2022

Possible Futures

Researchers unveil mystery inside Li- o2 batteries September 30th, 2022

Synthesis of air-stable room-temperature van der Waals magnetic thin flakes September 30th, 2022

Layer Hall effect and hidden Berry curvature in antiferromagnetic insulators September 30th, 2022

ACM Research Launches New Furnace Tool for Thermal Atomic Layer Deposition to Support Advanced Semiconductor Manufacturing Requirements: Ultra Fn A Furnace Tool Shipped to China-Based Foundry Customer September 30th, 2022

Spintronics

Synthesis of air-stable room-temperature van der Waals magnetic thin flakes September 30th, 2022

New road towards spin-polarised currents September 9th, 2022

Exploring quantum electron highways with laser light: Spiraling laser light reveals how topological insulators lose their ability to conduct electric current on their surfaces. August 19th, 2022

Rensselaer researchers learn to control electron spin at room temperature to make devices more efficient and faster: Electron spin, rather than charge, holds the key July 15th, 2022

Chip Technology

Conformal optical black hole for cavity September 30th, 2022

Synthesis of air-stable room-temperature van der Waals magnetic thin flakes September 30th, 2022

ACM Research Launches New Furnace Tool for Thermal Atomic Layer Deposition to Support Advanced Semiconductor Manufacturing Requirements: Ultra Fn A Furnace Tool Shipped to China-Based Foundry Customer September 30th, 2022

Key element for a scalable quantum computer: Physicists from Forschungszentrum Jülich and RWTH Aachen University demonstrate electron transport on a quantum chip September 23rd, 2022

Memory Technology

Rice team eyes cells for sophisticated data storage: National Science Foundation backs effort to turn living cells into equivalent of computer RAM August 19th, 2022

Scientists unravel ‘Hall effect’ mystery in search for next generation memory storage devices August 19th, 2022

Quantum network nodes with warm atoms June 24th, 2022

Boron nitride nanotube fibers get real: Rice lab creates first heat-tolerant, stable fibers from wet-spinning process June 24th, 2022

Announcements

Researchers unveil mystery inside Li- o2 batteries September 30th, 2022

Synthesis of air-stable room-temperature van der Waals magnetic thin flakes September 30th, 2022

Layer Hall effect and hidden Berry curvature in antiferromagnetic insulators September 30th, 2022

ACM Research Launches New Furnace Tool for Thermal Atomic Layer Deposition to Support Advanced Semiconductor Manufacturing Requirements: Ultra Fn A Furnace Tool Shipped to China-Based Foundry Customer September 30th, 2022

Grants/Sponsored Research/Awards/Scholarships/Gifts/Contests/Honors/Records

Drawing data in nanometer scale September 30th, 2022

Multi-institution, $4.6 million NSF grant to fund nanotechnology training September 9th, 2022

Understanding outsize role of nanopores: New research reveals differences in pH, and more, about these previously mysterious environments August 26th, 2022

New chip ramps up AI computing efficiency August 19th, 2022

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project