University at Buffalo physicists propose a new quantum sensor to detect antiferromagnets, a promising class of magnetic materials.
Researchers at the University at Buffalo have unveiled a theoretical framework for a quantum sensor aimed at detecting antiferromagnets, a unique category of magnetic materials. The findings, published in Physical Review Letters, do not propose a new magnetism type but rather a method to identify antiferromagnetic order, which still awaits experimental testing.
The proposed sensor utilizes a diamond embedded with a nitrogen-vacancy (NV) defect, which is sensitive to local magnetic fields. This defect is strategically placed near a suspected antiferromagnetic material, allowing researchers to measure the spin's orientation and the relaxation rate. An anisotropic relaxation rate could signal the presence of complex magnetic orders characteristic of antiferromagnets.
One notable aspect of this approach is its less invasive nature, addressing concerns with existing methods that may overly influence the sample, complicating the extraction of the material's inherent properties.
Jamir Marino, an assistant professor of physics at the University at Buffalo, leads the study along with co-authors Libor Šmejkal and Jairo Sinova from Johannes Gutenberg University in Mainz, who are credited with initially proposing the concept of antiferromagnets. The research also included contributions from Hossein Hosseinabadi and V.A.S.V. Bittencourt.
The growing interest in antiferromagnets stems from their promising applications in electronics, as they offer zero net magnetization while retaining beneficial electronic properties akin to ferromagnets, potentially leading to faster and more energy-efficient data transfer.
Evidence of antiferromagnetism has been detected in multiple materials, with theoretical predictions suggesting over 200 possible compounds, thus amplifying the need for reliable identification techniques.
While this research does not provide an immediate sensor, it establishes a measurement protocol that could pave the way for future experiments focused on discovering and verifying antiferromagnetic order.
