Strange Magnetism Discovered in Thin Ruthenium Dioxide Films

10:18 PM ETDeveloping

Technology Desk

In Short: Researchers have found evidence of unconventional magnetism in ruthenium dioxide when prepared as an ultrathin film, potentially opening new possibilities for computer memory.

Scientists have discovered a new form of magnetism in ruthenium dioxide when the material is prepared as an ultrathin film, just a few atomic layers thick. This finding, which challenges previous beliefs about the material's magnetic properties, could lead to advancements in computer memory technology.

Yi, an associate professor of physics and astronomy, explained that while ruthenium dioxide was initially proposed as a candidate for altermagnetic behavior, studies on its bulk form did not provide evidence of magnetism. However, in its ultrathin form, the material exhibits spin textures consistent with unconventional magnetism.

To investigate the material's magnetic behavior, the researchers used spin-resolved angle-resolved photoemission spectroscopy to map the electron spin patterns of ultrathin ruthenium dioxide. The team found that the electron structure of the material had to experience lattice strain, placing pressure on its atomic structure, to exhibit signs of altermagnetism. Without this strain, the electron spins did not show signs of this new form of magnetism.

The discovery of this new form of magnetism could potentially lead to smaller, faster, and more efficient computer memory. According to Yi, 'Our research shows that its ultrathin form, on the other hand, may be the key in making it magnetic.' This finding opens up new possibilities for the development of advanced materials and technologies.

What's confirmed

Now, researchers have found evidence that ruthenium dioxide, a quantum material long debated for its magnetic properties, may display this unusual form of magnetism when prepared as an ultrathin film only a few atomic layers thick.
“Ruthenium dioxide was one of the first materials to be proposed as an altermagnetic candidate, but studies on its bulk form didn’t return evidence of magnetism,” said Yi, an associate professor of physics and astronomy.
“After analyzing our measurements, including informing our interpretation with theoretical calculations, we found that, in our experimental conditions, the ruthenium dioxide shows spin textures consistent with unconventional magnetism,” said Yichen Zhang, the first author on the paper and a recent Rice graduate.
Spin texture describes how the magnetic moments associated with electrons are arranged throughout a material.
By mapping those patterns, scientists can determine whether a material is magnetic and what kind of magnetism it may possess.

What's still developing

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