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Instruments / Technical Area	Publication Details	Published	Actions
I10-Beamline for Advanced Dichroism - scattering	Switching of ferrotoroidal domains via an intermediate mixed state in the multiferroic Y-type hexaferrite Ba0.5Sr1.5Mg2Fe12O22 Jiahao Chen , Francis Chmiel , Jieyi Liu , Dharmalingam Prabhakaran , Paolo G. Radaelli , Roger Johnson Physical Review B 110 DOI: 10.1103/PhysRevB.110.134410 Diamond Proposal Number(s): [17388] Open Access Show Abstract ▼ Abstract: We report a detailed study of the magnetic field switching of ferrotoroidal/multiferroic domains in the Y-type hexaferrite compound Ba0.5⁢Sr1.5⁢Mg2⁢Fe12⁢O22. By combining data from superconducting quantum interference device (SQUID) magnetometry, magnetocurrent measurements, and resonant x-ray scattering experiments, we arrive at a complete description of the deterministic switching, which involves the formation of a temperature-dependent mixed state in low magnetic fields. This mechanism is likely to be shared by other members of the hexaferrite family, and presents a challenge for the development of high-speed read-write memory devices based on these materials.	Oct 2024
I06-Nanoscience (XPEEM)	Antiferromagnetic half-skyrmions and bimerons at room temperature Hariom Jani , Jheng-Cyuan Lin , Jiahao Chen , Jack Harrison , Francesco Maccherozzi , Jonathon Schad , Saurav Prakash , Chang-Beom Eom , A. Ariando , Thirumalai Venkatesan , Paolo G. Radaelli Nature 590, 74 - 79 DOI: 10.1038/s41586-021-03219-6 Diamond Proposal Number(s): [23857, 20317] Show Abstract ▼ Abstract: In the quest for post-CMOS (complementary metal–oxide–semiconductor) technologies, driven by the need for improved efficiency and performance, topologically protected ferromagnetic ‘whirls’ such as skyrmions and their anti-particles have shown great promise as solitonic information carriers in racetrack memory-in-logic or neuromorphic devices. However, the presence of dipolar fields in ferromagnets, which restricts the formation of ultrasmall topological textures, and the deleterious skyrmion Hall effect, when skyrmions are driven by spin torques have thus far inhibited their practical implementation. Antiferromagnetic analogues, which are predicted to demonstrate relativistic dynamics, fast deflection-free motion and size scaling, have recently become the subject of intense focus, but they have yet to be experimentally demonstrated in natural antiferromagnetic systems. Here we realize a family of topological antiferromagnetic spin textures in α-Fe2O3—an Earth-abundant oxide insulator—capped with a platinum overlayer. By exploiting a first-order analogue of the Kibble–Zurek mechanism2, we stabilize exotic merons and antimerons (half-skyrmions)8 and their pairs (bimerons), which can be erased by magnetic fields and regenerated by temperature cycling. These structures have characteristic sizes of the order of 100 nanometres and can be chemically controlled via precise tuning of the exchange and anisotropy, with pathways through which further scaling may be achieved. Driven by current-based spin torques from the heavy-metal overlayer, some of these antiferromagnetic textures could emerge as prime candidates for low-energy antiferromagnetic spintronics at room temperature.	Feb 2021

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I10-Beamline for Advanced Dichroism - scattering

Switching of ferrotoroidal domains via an intermediate mixed state in the multiferroic Y-type hexaferrite Ba0.5Sr1.5Mg2Fe12O22

Jiahao Chen , Francis Chmiel , Jieyi Liu , Dharmalingam Prabhakaran , Paolo G. Radaelli , Roger Johnson

Physical Review B 110

DOI: 10.1103/PhysRevB.110.134410

Diamond Proposal Number(s): [17388]