Nanomagnetics

News and Updates

NIST Researchers Use Cellphone Compass to Measure Tiny Concentrations of Compounds Important for Human Health

April 1, 2024

Nearly every modern cellphone has a built-in compass, or magnetometer, that detects the direction of Earth’s magnetic field, providing critical information for

Imaging the Elusive Skyrmion

September 25, 2023

Scientists at the National Institute of Standards and Technology (NIST) with colleagues elsewhere have employed neutron imaging and a reconstruction algorithm

Sam Oberdick and Gary Zabow pose for a picture, standing together with lab equipment in the background.

Spotlight: The Creative Minds Working Behind the Scenes on Agents of MRI Contrast

July 7, 2023

You might not recognize these two faces from such NIST social media hits as “microprinting with candy” and “molds for microparticles,” but they were behind that

Projects and Programs

A current (white arrow) flowing through a tantalum film generates a current of spins (dark blue arrows) that impinges on the ferromagnetic cobalt iron boron layer and causes the magnetization (gold arrow) to charge directions (light blue arrow).

A ferromagnetic material such as iron acquires its magnetization because the magnetic orientation of its constituent atoms all line up in the same way. Because individual electrons also have an intrinsic magnetic moment – which is often referred to as the electron “spin” - they can interact with

Fig. 1. Die containing 285 superparamagnetic tunnel junctions.

Spintronics for Neuromorphic Computing

Ongoing

Magnetic tunnel junctions (see Fig. 1) consist of two thin films of ferromagnetic material separated by a few atomic layers of an insulating material. The insulator is so thin that electrons can tunnel quantum mechanically through it. The rate at which the electrons tunnel is affected by the

Video microscopic image - Rotation and translation.

Control of Magnetic Nanoparticles for Nanoscale Manipulation of Fluids and Materials (Archived)

Completed

Low Reynolds number swimming, or motion through a viscous fluid, is a technique at which nature is adept. Bacteria, protists, and algal cells live in a regime where viscous effects dominate inertial ones. As these microscale biological swimmers move, they perturb the fluid around them, affecting

Computational Micromagnetics

Ongoing

Micromagnetics technologies constitute the foundation of computer storage devices. Exponential growth in the size of portable magnetic memories accompanied by decrease cost-per-byte is evidence of success in this technology. To sustain this growth engineers and scientists are increasingly using

Publications

Nagaoka ferromagnetism in 3 × 3 arrays and beyond

December 26, 2024

Author(s)

Yan Li, Keyi Liu, Garnett Bryant

Nagaoka ferromagnetism (NF) is a long-predicted example of itinerant ferromagnetism (IF) in the Hubbard model that has been studied theoretically for many years

Three-dimensional nature 1 of anomalous Hall conductivity in YMn6Sn6−xGax, x ≈ 0.55

November 19, 2024

Author(s)

Albert Davydov, Hari "Bhandari ", Zhenhua Ning, Po-Hao Chang, Peter Siegfried, Resham Regmi, Mohamed El Gazzah, Allen Oliver, Liqin Ke, Igor Mazin, Nirmal Ghimire

The unique connectivity of kagome lattices gives rise to topological properties such as flat bands and Dirac cones. When combined with ferromagnetism and with

Parallel 3D Temperature Image Reconstruction Using Multi-Color Magnetic Particle Imaging (MPI)

October 18, 2024

Author(s)

Klaus Natorf Quelhas, Mark-Alexander Henn, Ricardo Cordeiro de Farias, Weston L. Tew, Solomon I. Woods

Magnetic Particle Imaging (MPI) is a novel technique developed for remotely detecting magnetic nanoparticle (MNP) tracers, with great potential for biomedical

Measurement-driven Langevin modeling of superparamagnetic tunnel junctions

July 23, 2024

Author(s)

Liam Pocher, Temitayo Adeyeye, Sidra Gibeault, Philippe Talatchian, Ursula Ebels, Daniel Lathrop, Jabez J. McClelland, Mark Stiles, Advait Madhavan, Matthew Daniels

Superparamagnetic tunnel junctions are important devices for a range of emerging technologies, but most existing compact models capture only their mean