{"title":"Nonlinear sigma-model approach to the coupled spin-charge dynamics in the presence of Rashba spin-orbit coupling (Conference Presentation)","authors":"R. Raimondi, Alessandro Veneri","doi":"10.1117/12.2527690","DOIUrl":"https://doi.org/10.1117/12.2527690","url":null,"abstract":"","PeriodicalId":420411,"journal":{"name":"Spintronics XII","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131229007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Gradient expansion approaches to chiral electric transport effects in topological solitons (Conference Presentation)","authors":"F. Lux","doi":"10.1117/12.2528747","DOIUrl":"https://doi.org/10.1117/12.2528747","url":null,"abstract":"Chiral magnetic systems gain more and more relevance for future information technology. Aside from the now famous proposal of skyrmionic information bits, recent publications suggest possible applications in the field of neuromorphic computing in the form of skyrmionic reservoirs which rely on their non-linear magnetoresistance. Despite its practical importance, a general physical understanding of the electrical transport through chiral magnets is yet to be reached. Experimental studies of the Hall conductivity in chiral magnets commonly face the challenge of how to decompose the measured signal into several parts with a clear physical interpretation. Theoretical investigations on the other hand struggle with the complex electronic structure, especially in the case of isolated topological solitons. Inspired by our recent work on the orbital magnetism of chiral magnets, we demonstrate how a semiclassical gradient expansion can shed some light on the classification of Hall effects in chiral magnets. These results may open up new perspectives for the all-electrical detection of non-collinear magnetic structures such as skyrmions, hopfions and chiral bobbers.","PeriodicalId":420411,"journal":{"name":"Spintronics XII","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126848535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xuan Hu, Maverick Chauwin, F. García-Sánchez, Neilesh Betrabet, C. Moutafis, J. Friedman
{"title":"Cascaded skyrmion logic system inspired by conservative logic (Conference Presentation)","authors":"Xuan Hu, Maverick Chauwin, F. García-Sánchez, Neilesh Betrabet, C. Moutafis, J. Friedman","doi":"10.1117/12.2530015","DOIUrl":"https://doi.org/10.1117/12.2530015","url":null,"abstract":"Spintronics is widely explored as a replacement of CMOS for next-generation computing systems. In particular, magnetic skyrmions efficiently carry information due to their topological stability, non-volatility, low-current motion, and small size. Here we propose a skyrmion logic system that includes a direct cascading mechanism, enabling the implementation of large-scale skyrmion computing systems. This system leverages the rich physics of magnetic skyrmions, including the spin-Hall effect, skyrmion-Hall effect, skyrmion-skyrmion repulsion, repulsion between skyrmions and the track boundaries, and electrical current-control of notch depinning. A force generated by the spin-Hall effect moves skyrmions within ferromagnetic tracks due to repulsion from the track boundaries, and the interplay between the skyrmion-Hall effect and skyrmion-skyrmion repulsion enable logical operations at track junctions. Direct cascading is achieved by using the output skyrmions of one logic gate as inputs to other logic gates. To ensure correct functionality and enable large-scale systems, a global clock provides periodic current pulses in order to the synchronize skyrmion motion past notches in the track. In this conservative logic system, skyrmions are never destroyed during logical operations, thus eliminating the need to generate skyrmions, reducing energy consumption, and simplifying experimental demonstration.","PeriodicalId":420411,"journal":{"name":"Spintronics XII","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115102194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Spintronics XIIPub Date : 2018-04-09DOI: 10.1103/PhysRevB.98.214512
S. Boutin, J. C. Lemyre, I. Garate
{"title":"Majorana bound state engineering via efficient real-space parameter optimization (Conference Presentation)","authors":"S. Boutin, J. C. Lemyre, I. Garate","doi":"10.1103/PhysRevB.98.214512","DOIUrl":"https://doi.org/10.1103/PhysRevB.98.214512","url":null,"abstract":"Recent progress toward the fabrication of Majorana-based qubits has sparked the need for systematic approaches to optimize experimentally relevant parameters for the realization of robust Majorana bound states. Here, we introduce an efficient numerical method for the real-space optimization of tunable parameters, such as electrostatic potential profiles and magnetic field textures, in Majorana wires. Combining ideas from quantum control and quantum transport, our algorithm, applicable to any noninteracting tight-binding model, operates on a largely unexplored parameter space and opens new routes for Majorana bound states with enhanced robustness. Contrary to common belief, we find that spatial inhomogeneities of parameters can be a resource for the engineering of Majorana bound states.","PeriodicalId":420411,"journal":{"name":"Spintronics XII","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128373986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}