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#altermagnetism

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Public
Chuck Darwin

In what's referred to as #altermagnetism,
particles are arranged in a canceling fashion like antiferromagnetism,
yet rotated just enough to allow for confined forces on a nanoscale
– not enough to pin a grocery list to your freezer,
but with discrete properties that engineers are keen to manipulate into storing data or channeling energy.

"Altermagnets consist of magnetic moments that point antiparallel to their neighbors,"
explains University of Nottingham physicist Peter Wadley.

"However, each part of the crystal hosting these tiny moments is rotated with respect to its neighbours.

This is like antiferromagnetism with a twist!
But this subtle difference has huge ramifications."

Experiments have since confirmed the existence of this in-between 'alter' magnetism.
However, none had directly demonstrated it was possible to manipulate its tiny magnetic vortices in ways that might prove useful.

Wadley and his colleagues demonstrated that a sheet of manganese telluride just a few nanometers thick could be distorted in ways that intentionally created distinct magnetic whirlpools on the wafer's surface
search.app/K1DrdDsLL2bg5Jhh6

ScienceAlert · Physicists Confirm The Existence of a Third Form of MagnetismAn experiment in Sweden has demonstrated control over a novel kind of magnetism, giving scientists a new way to explore a phenomenon with huge potential to improve electronics – from memory storage to energy efficiency.
Public
Ashwin Nanjappa 🐘

"The fields of atoms in an antiferromagnetic material point in opposite directions to those of their neighbours, cancelling each other out perfectly."

"In altermagnetism, neighbouring atoms could end up with spins pointing in opposite directions if the atoms themselves were rotated by 90 degrees compared with their neighbours."

economist.com/science-and-tech

Figure showing direction of magnetic fields in ferromagnetic, antiferromagnetic and altermagnetic materials.
#TheEconomist#antiferromagnetic#altermagnetism
Public
katch wreck

"The crystal-symmetry basis makes #altermagnetism one of the elementary phases of matter, which—remarkably—has been omitted for nearly a century of the band theory of solids. Our results highlight the strength of the spin-group-symmetry classification in unravelling new magnetic phases and in describing the hierarchy of energy scales that underpin their rich phenomenology and potential applications"

nature.com/articles/s41586-023

NatureAltermagnetic lifting of Kramers spin degeneracy - NatureUsing photoemission spectroscopy and ab initio calculations, evidence is given of two distinct unconventional mechanisms of lifted Kramers spin degeneracy generated by the altermagnetic phase of centrosymmetric MnTe with vanishing net magnetization.
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