Wesley Lohr;Pavan Chaitanya;Arjun Modi;Kai Feng;Angelina Lee;Mohannad Tashli;Ravi L. Hadimani
{"title":"控制经颅磁场线圈场廓线的新型适形屏蔽坡莫合金复合材料","authors":"Wesley Lohr;Pavan Chaitanya;Arjun Modi;Kai Feng;Angelina Lee;Mohannad Tashli;Ravi L. Hadimani","doi":"10.1109/TMAG.2025.3562780","DOIUrl":null,"url":null,"abstract":"Permalloy nanoparticle-based composite films as a magnetic shield for transcranial magnetic stimulation (TMS) applications redirect magnetic field lines away from shielded regions to potentially protect implantable devices, mitigate overstimulation of cortical areas when targeting deep brain regions, and maintain patient comfort when compared to the non-conformable metallic shields that, due to Lorentz forces, cause noise issues when the magnetic field is applied to the metal. The shields are conformable and moldable to perfectly interface between the geometry of the TMS coil and that of the patient’s head. Our results show that a heavily loaded polydimethylsiloxane (PDMS) permalloy composite can effectively shield low strength magnetic fields from TMS coils. The composite saturates quickly with higher fields but with some modifications and further study, it shows promise as a conformable shielding material for TMS and other wearable shielding of low frequency and dc magnetic field applications. We also compared the experimental results to ANSYS Maxwell magnetostatic simulations and fully characterize the composite materials magnetic properties and microstructure.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"61 9","pages":"1-5"},"PeriodicalIF":1.9000,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Novel Conformable Shielding Permalloy Composite for Controlling Field Profiles of Transcranial Magnetic Field Coils\",\"authors\":\"Wesley Lohr;Pavan Chaitanya;Arjun Modi;Kai Feng;Angelina Lee;Mohannad Tashli;Ravi L. Hadimani\",\"doi\":\"10.1109/TMAG.2025.3562780\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Permalloy nanoparticle-based composite films as a magnetic shield for transcranial magnetic stimulation (TMS) applications redirect magnetic field lines away from shielded regions to potentially protect implantable devices, mitigate overstimulation of cortical areas when targeting deep brain regions, and maintain patient comfort when compared to the non-conformable metallic shields that, due to Lorentz forces, cause noise issues when the magnetic field is applied to the metal. The shields are conformable and moldable to perfectly interface between the geometry of the TMS coil and that of the patient’s head. Our results show that a heavily loaded polydimethylsiloxane (PDMS) permalloy composite can effectively shield low strength magnetic fields from TMS coils. The composite saturates quickly with higher fields but with some modifications and further study, it shows promise as a conformable shielding material for TMS and other wearable shielding of low frequency and dc magnetic field applications. We also compared the experimental results to ANSYS Maxwell magnetostatic simulations and fully characterize the composite materials magnetic properties and microstructure.\",\"PeriodicalId\":13405,\"journal\":{\"name\":\"IEEE Transactions on Magnetics\",\"volume\":\"61 9\",\"pages\":\"1-5\"},\"PeriodicalIF\":1.9000,\"publicationDate\":\"2025-04-21\",\"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/10971366/\",\"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/10971366/","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}
Novel Conformable Shielding Permalloy Composite for Controlling Field Profiles of Transcranial Magnetic Field Coils
Permalloy nanoparticle-based composite films as a magnetic shield for transcranial magnetic stimulation (TMS) applications redirect magnetic field lines away from shielded regions to potentially protect implantable devices, mitigate overstimulation of cortical areas when targeting deep brain regions, and maintain patient comfort when compared to the non-conformable metallic shields that, due to Lorentz forces, cause noise issues when the magnetic field is applied to the metal. The shields are conformable and moldable to perfectly interface between the geometry of the TMS coil and that of the patient’s head. Our results show that a heavily loaded polydimethylsiloxane (PDMS) permalloy composite can effectively shield low strength magnetic fields from TMS coils. The composite saturates quickly with higher fields but with some modifications and further study, it shows promise as a conformable shielding material for TMS and other wearable shielding of low frequency and dc magnetic field applications. We also compared the experimental results to ANSYS Maxwell magnetostatic simulations and fully characterize the composite materials magnetic properties and microstructure.
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.