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Room-temperature stabilization of antiferromagnetic skyrmions in synthetic antiferromagnets
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Room-temperature stabilization of antiferromagnetic skyrmions in synthetic antiferromagnets
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Room-temperature stabilization of antiferromagnetic skyrmions in synthetic antiferromagnets
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Journal Article
Room-temperature stabilization of antiferromagnetic skyrmions in synthetic antiferromagnets
2020
Overview
Room-temperature skyrmions in ferromagnetic films and multilayers show promise for encoding information bits in new computing technologies. Despite recent progress, ferromagnetic order generates dipolar fields that prevent ultrasmall skyrmion sizes, and allows a transverse deflection of moving skyrmions that hinders their efficient manipulation. Antiferromagnetic skyrmions shall lift these limitations. Here we demonstrate that room-temperature antiferromagnetic skyrmions can be stabilized in synthetic antiferromagnets (SAFs), in which perpendicular magnetic anisotropy, antiferromagnetic coupling and chiral order can be adjusted concurrently. Utilizing interlayer electronic coupling to an adjacent bias layer, we demonstrate that spin-spiral states obtained in a SAF with vanishing perpendicular magnetic anisotropy can be turned into isolated antiferromagnetic skyrmions. We also provide model-based estimates of skyrmion size and stability, showing that room-temperature antiferromagnetic skyrmions below 10 nm in radius can be anticipated in further optimized SAFs. Antiferromagnetic skyrmions in SAFs may thus solve major issues associated with ferromagnetic skyrmions for low-power spintronic devices.
Antiferromagnetic skyrmions—which have distinct advantages over skyrmions found in other magnetic systems—are observed at room temperature in synthetic antiferromagnets. These results hold promise for low-power spintronic devices.
Publisher
Nature Publishing Group UK,Nature Publishing Group
