{"paper_id":"3bdace0f-a4f4-48b6-8b99-55db5d4ee4e5","body_text":"Emergence of insulating ferro- and ferrimagnetism with enhanced optical properties in double-double perovskite oxides | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article Emergence of insulating ferro- and ferrimagnetism with enhanced optical properties in double-double perovskite oxides Monirul Shaikh, Fengyi Zhou, Sathyamoorthi Buvaneswaran, Rajan Gowsalya, and 3 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-5335245/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract The emergence of ferro-and ferrimagnetic behavior in insulating materials is uncommon, largely due to Pauli’s exclusion principle, which typically favors antiferromagnetic spin alignment between neighboring species. Utilizing symmetry analysis, first-principles methods, and classical Monte Carlo simulations, we report technologically important insulating ferro-and ferrimagnetic double-double perovskite oxides. Our study identifies LaA ′ MnNiO6 (A ′ = V, Cr, Mn, Co, and Ni) as promising candidates exhibiting band gaps between 1.3 eV and 2.2 eV, calculated using the modified Becke-Johnson exchange-correlation potential. These compounds are particularly relevant for spintronic and optical applications. We explain the mechanisms driving band gap openings and magnetic exchange interactions in these ferro-and ferrimagnetic compounds. Monte Carlo simulations, together with state-of-the-art orbital-decomposed exchange parameter analysis, reveal intriguing variations in magnetic transition temperatures (up to 242 K) and the corresponding exchange mechanisms in all LaA ′ MnNiO6 compounds are discussed. Additionally, we assess the thermody-namic and dynamic stability of these compounds, confirming their feasibility for practical applications. Physical sciences/Materials science Physical sciences/Materials science/Theory and computation Physical sciences/Materials science/Theory and computation/Electronic structure Ferro- and ferrimagnetic insulators Double-double perovskites Band gap engineering Photovoltaics High Curie temperatures Magnetic exchange mechanisms Spintronics Full Text Additional Declarations No competing interests reported. Supplementary Files SMEmergenceofInsulatingFerroandFerrimagnetism.pdf Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {\"props\":{\"pageProps\":{\"initialData\":{\"identity\":\"rs-5335245\",\"acceptedTermsAndConditions\":true,\"allowDirectSubmit\":true,\"archivedVersions\":[],\"articleType\":\"Article\",\"associatedPublications\":[],\"authors\":[{\"id\":379730176,\"identity\":\"4b22b968-d42b-42c0-9c37-a6d675283ec3\",\"order_by\":0,\"name\":\"Monirul Shaikh\",\"email\":\"\",\"orcid\":\"\",\"institution\":\"SRM Institute of Science and Technology\",\"correspondingAuthor\":false,\"prefix\":\"\",\"firstName\":\"Monirul\",\"middleName\":\"\",\"lastName\":\"Shaikh\",\"suffix\":\"\"},{\"id\":379730177,\"identity\":\"4254c7b8-2fd5-496d-9a4f-1b86214981e4\",\"order_by\":1,\"name\":\"Fengyi 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