{"title":"一种改进的两相模型,用于解决锥形线管异质结构中磁化逆转机制和矫顽力角依赖性的问题","authors":"Akhila Priya Kotti;Amaresh Chandra Mishra","doi":"10.1109/TMAG.2025.3601608","DOIUrl":null,"url":null,"abstract":"Integrating different geometries into a single nanostructure paves the way to obtain magnetic properties available in both isolated geometries. Wire and tube nanostructures are among the most explored morphologies in the ferromagnetic cylindrical structure area. This work examines wire–tube heterostructures with the inclusion of bulged and tapered diameter modulations, which enhance the control over static magnetic properties. An extra step is observed in the hysteresis loops corresponding to the switching originated initially in the tube region, followed by the wire region. The pinning of the domain wall at the wire–tube interface can also be observed. Remanent states show that vortex domain walls can be nucleated at the ends along with the interface, depending on the radius and the type of modulation. The core region of the vortex configuration is shifted for low values of radius, resulting in a unique arrangement of spins just before reversal. Angular variation of coercivity dictates that the reversal mechanism follows propagation of domain walls along with rotation to initially switch the spins in the tube region and later in the wire region till a certain critical angle. Later, the entire wire–tube structure shows pseudocoherent rotation. A modified two-phase (MTP) model is formulated to fit the simulated data of angular coercivity below the critical angle. Above the critical angle, the Stoner–Wohlfarth (SW) model fits well with simulated data. It has been demonstrated that in the case of extremely tapered wire–tube structures, the critical angle is almost nonexistent, and the MTP model explains the reversal mechanism at all field inclinations.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"61 10","pages":"1-12"},"PeriodicalIF":1.9000,"publicationDate":"2025-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"A Modified Two-Phase Model to Address the Magnetization Reversal Mechanism and Angular Dependence of Coercivity in Conical Wire–Tube Heterostructures\",\"authors\":\"Akhila Priya Kotti;Amaresh Chandra Mishra\",\"doi\":\"10.1109/TMAG.2025.3601608\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Integrating different geometries into a single nanostructure paves the way to obtain magnetic properties available in both isolated geometries. Wire and tube nanostructures are among the most explored morphologies in the ferromagnetic cylindrical structure area. This work examines wire–tube heterostructures with the inclusion of bulged and tapered diameter modulations, which enhance the control over static magnetic properties. An extra step is observed in the hysteresis loops corresponding to the switching originated initially in the tube region, followed by the wire region. The pinning of the domain wall at the wire–tube interface can also be observed. Remanent states show that vortex domain walls can be nucleated at the ends along with the interface, depending on the radius and the type of modulation. The core region of the vortex configuration is shifted for low values of radius, resulting in a unique arrangement of spins just before reversal. Angular variation of coercivity dictates that the reversal mechanism follows propagation of domain walls along with rotation to initially switch the spins in the tube region and later in the wire region till a certain critical angle. Later, the entire wire–tube structure shows pseudocoherent rotation. A modified two-phase (MTP) model is formulated to fit the simulated data of angular coercivity below the critical angle. Above the critical angle, the Stoner–Wohlfarth (SW) model fits well with simulated data. It has been demonstrated that in the case of extremely tapered wire–tube structures, the critical angle is almost nonexistent, and the MTP model explains the reversal mechanism at all field inclinations.\",\"PeriodicalId\":13405,\"journal\":{\"name\":\"IEEE Transactions on Magnetics\",\"volume\":\"61 10\",\"pages\":\"1-12\"},\"PeriodicalIF\":1.9000,\"publicationDate\":\"2025-08-22\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"IEEE Transactions on Magnetics\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://ieeexplore.ieee.org/document/11134310/\",\"RegionNum\":3,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"ENGINEERING, ELECTRICAL & ELECTRONIC\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Transactions on Magnetics","FirstCategoryId":"5","ListUrlMain":"https://ieeexplore.ieee.org/document/11134310/","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
A Modified Two-Phase Model to Address the Magnetization Reversal Mechanism and Angular Dependence of Coercivity in Conical Wire–Tube Heterostructures
Integrating different geometries into a single nanostructure paves the way to obtain magnetic properties available in both isolated geometries. Wire and tube nanostructures are among the most explored morphologies in the ferromagnetic cylindrical structure area. This work examines wire–tube heterostructures with the inclusion of bulged and tapered diameter modulations, which enhance the control over static magnetic properties. An extra step is observed in the hysteresis loops corresponding to the switching originated initially in the tube region, followed by the wire region. The pinning of the domain wall at the wire–tube interface can also be observed. Remanent states show that vortex domain walls can be nucleated at the ends along with the interface, depending on the radius and the type of modulation. The core region of the vortex configuration is shifted for low values of radius, resulting in a unique arrangement of spins just before reversal. Angular variation of coercivity dictates that the reversal mechanism follows propagation of domain walls along with rotation to initially switch the spins in the tube region and later in the wire region till a certain critical angle. Later, the entire wire–tube structure shows pseudocoherent rotation. A modified two-phase (MTP) model is formulated to fit the simulated data of angular coercivity below the critical angle. Above the critical angle, the Stoner–Wohlfarth (SW) model fits well with simulated data. It has been demonstrated that in the case of extremely tapered wire–tube structures, the critical angle is almost nonexistent, and the MTP model explains the reversal mechanism at all field inclinations.
期刊介绍:
Science and technology related to the basic physics and engineering of magnetism, magnetic materials, applied magnetics, magnetic devices, and magnetic data storage. The IEEE Transactions on Magnetics publishes scholarly articles of archival value as well as tutorial expositions and critical reviews of classical subjects and topics of current interest.