Elizabeth M Jefremovas, Kilian Leutner, Miriam G Fischer, Jorge Marqués-Marchán, Thomas B Winkler, Agustina Asenjo, Jairo Sinova, Robert Frömter, Mathias Kläui
{"title":"The role of magnetic dipolar interactions in skyrmion lattices.","authors":"Elizabeth M Jefremovas, Kilian Leutner, Miriam G Fischer, Jorge Marqués-Marchán, Thomas B Winkler, Agustina Asenjo, Jairo Sinova, Robert Frömter, Mathias Kläui","doi":"10.1016/j.newton.2025.100036","DOIUrl":"https://doi.org/10.1016/j.newton.2025.100036","url":null,"abstract":"<p><p>Magnetic skyrmions are topological two-dimensional (2D) spin textures that can be stabilized at room temperature and low magnetic fields in magnetic multilayer stacks. Besides their envisioned applications in data storage and processing, these 2D quasiparticles constitute an ideal model system to study 2D particle properties. More precisely, the role of inter-particle dipolar interactions in 2D ensembles can be fully captured in skyrmion lattices. We engineer a multilayer stack hosting skyrmion lattices and increase the relevance of the dipolar coupling by increasing the number of repetitions <i>n</i> from <math><mrow><mi>n</mi> <mo>=</mo> <mn>1</mn></mrow> </math> to <math><mrow><mi>n</mi> <mo>=</mo> <mn>30</mn></mrow> </math> . To ascertain the impact on the spin structure, we carry out a series of imaging experiments and find a drastic change of the skyrmion size. We develop an analytical description for the skyrmion radius in the whole multilayer regime, from thin to thick film limits, identifying the key impact of the nucleation process leading to the skyrmion lattice. Our work provides a detailed understanding of the skyrmion-skyrmion interaction, clarifying the role of dipolar interactions as the multilayer stack is expanded in the z direction.</p>","PeriodicalId":520445,"journal":{"name":"Newton ((New York, N.Y.)","volume":"1 2","pages":"None"},"PeriodicalIF":0.0,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11976062/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144061284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Samuel Mañas-Valero, Toeno van der Sar, Rembert A Duine, Bart van Wees
{"title":"Fundamentals and applications of van der Waals magnets in magnon spintronics.","authors":"Samuel Mañas-Valero, Toeno van der Sar, Rembert A Duine, Bart van Wees","doi":"10.1016/j.newton.2025.100018","DOIUrl":"10.1016/j.newton.2025.100018","url":null,"abstract":"<p><p>Spintronics is concerned with replacing charge current with current of spin, the electron's intrinsic angular momentum. In magnetic insulators, spin currents are carried by magnons, the quanta of spin-wave excitations on top of the magnetically ordered state. Magnon spin currents are especially promising for information technology due to their low intrinsic damping, non-reciprocal transport, micrometer wavelengths at microwave frequencies, and strong interactions that enable signal transduction. In this perspective, we give our view on the progress and challenges toward realizing magnon spintronics based on atomically thin van der Waals magnets, a recently discovered class of magnetic materials of which the tunability and versatility have attracted a great deal of ongoing research.</p>","PeriodicalId":520445,"journal":{"name":"Newton ((New York, N.Y.)","volume":"1 1","pages":"None"},"PeriodicalIF":0.0,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11886975/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143589543","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}