Antiferromagnetic Spintronics

 


Antiferromagnetic spintronics has had an interesting break through. Research is being crafted from the University of Nebraska-Lincoln. Spintronics has had limited functions because of their need for excessive power.

The team has been using a technique called B-doping. This is the introduction of boron into magnetoelectric oxides. This process can control magnetic fields at high temperatures that often appear in electronics. 

The study was recently published in the journal Advances Functional Materials. Christian Binek is a Charles Bessey Professor of physics. He reports that this has been the "holy grail" of this type of research. 

Spintronics is the driving force behind the technology of next generation nano electronic devices. Many discoveries over the last three decades were made in the spintronics field. One major stumbling block was the search for a quantum material whose magnetic states could be altered by electronic means and altered in above-room temperature conditions. 

The team discovered chromium oxide (and a small amount of boron) could potentially create devices that use far less power while running faster than modern day electronics. 

Chromium oxide shows antiferromagnetism. This substance features alternating columns of atoms. These atoms have poles that point in opposite directions. Therefore, they effectively cancel each other out, causing no magnetic field. Researchers have used chromium oxide in the past, as it permitted voltage control of the antiferromagnetic order.  It was very limited, because chromium oxide did not work at high temperatures. It also required a symmetry breaking applied magnetic field. 

Abdelghani Laraoui is an assistant professor of mechanical engineering and materials engineering. He created a way to observe and confirm that boron doping works. He used a nitrogen vacancy scanning probe microscope. 

Using NV microscopy, the team observed the boundary magnetization and saw the effects of B-doping, reported Laraoui. Laraoui had previously published similar work in 2022 in a journal called RSC Advances. Laraoui's NV images confirm research that could only be theorized!

This process provides a new way to see objects in the nanoscale realm. 

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