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Readout of an antiferromagnetic spintronics system by strong exchange coupling

Within spin-based electronics (spintronics), a novel approach promising ultrafast and stable magnetic memory is based on antiferromagnets as active elements. These materials without macroscopic magnetization but with a staggered orientation of their microscopic magnetic moments display intrinsic dynamics in the Terahertz (THz) range and are robust against magnetic fields.

However, technologically relevant read-out in spintronics requires significant magnetoresistance effects, i.e., resistance changes larger than 20 percent should be associated with a reorientation of the staggered magnetization. This represents a major challenge in antiferromagnetic spintronics.

New approach enables the well-established read-out methods of ferromagnets

As published in the online science journal Nature Communications, scientists of the Institute of Â鶹ÒùÔºics of Johannes Gutenberg University Mainz (JGU), within an international collaboration, are now able to demonstrate a strong exchange coupling of very thin ferromagnetic layers to the prototypical antiferromagnetic spintronics compound of manganese and gold (Mn2Au). This allows us to benefit from the well-established read-out methods of ferromagnets, while the essential advantages of antiferromagnetic spintronics are only slightly diminished.