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Instruments / Technical Area	Publication Details	Published
I10-Beamline for Advanced Dichroism - scattering	Spin pumping through nanocrystalline topological insulators David M. Burn , Jheng-Cyuan Lin , Ryuji Fujita , Barat Achinuq , Joshua Bibby , Angadjit Singh , Andreas Frisk , Gerrit Van Der Laan , Thorsten Hesjedal Nanotechnology DOI: 10.1088/1361-6528/acc663 Diamond Proposal Number(s): [21872, 27487] Open Access Show Abstract ▼ Abstract: The topological surface states (TSSs) in topological insulators (TIs) offer exciting prospects for dissipationless spin transport. Common spin-based devices, such as spin valves, rely on trilayer structures in which a non-magnetic (NM) layer is sandwiched between two ferromagnetic (FM) layers. The major disadvantage of using high-quality single-crystalline TI films in this context is that a single pair of spin-momentum locked channels spans across the entire film, meaning that only a very small spin current can be pumped from one FM to the other, along the side walls of the film. On the other hand, using nanocrystalline TI films, in which the grains are large enough to avoid hybridization of the TSSs, will effectively increase the number of spin channels available for spin pumping. Here, we used an element-selective, x-ray based ferromagnetic resonance technique to demonstrate spin pumping from a FM layer at resonance through the TI layer and into the FM spin sink.	Mar 2023
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
I06-Nanoscience (XPEEM)	A metal–insulator transition of the buried MnO2 monolayer in complex oxide heterostructure Heng-Jui Liu , Jheng-Cyuan Lin , Yue-Wen Fang , Jing-Ching Wang , Bo-Chao Huang , Xiang Gao , Rong Huang , Philip R. Dean , Peter Hatton , Yi-Ying Chin , Hong-Ji Lin , Chien-Te Chen , Yuichi Ikuhara , Ya-Ping Chiu , Chia-Seng Chang , Chun-Gang Duan , Qing He , Ying-Hao Chu Advanced Materials 28, 9142 - 9151 DOI: 10.1002/adma.201602281 Show Abstract ▼ Abstract: A novel artificially created MnO2 monolayer system is demonstrated in atomically controlled epitaxial perovskite heterostructures. With careful design of different electrostatic boundary conditions, a magnetic transition as well as a metal–insulator transition of the MnO2 monolayer is unveiled, providing a fundamental understanding of dimensionality-confined strongly correlated electron systems and a direction to design new electronic devices.	Nov 2016

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