title: Tunable magnetic nanowires for biomedical and harsh environment applications.
abstract: We have synthesized nanowires with an iron core and an iron oxide (magnetite) shell by a facile low-cost fabrication process. The magnetic properties of the nanowires can be tuned by changing shell thicknesses to yield remarkable new properties and multi-functionality. A multi-domain state at remanence can be obtained, which is an attractive feature for biomedical applications, where a low remanence is desirable. The nanowires can also be encoded with different remanence values. Notably, the oxidation process of single-crystal iron nanowires halts at a shell thickness of 10 nm. The oxide shell of these nanowires acts as a passivation layer, retaining the magnetic properties of the iron core even during high-temperature operations. This property renders these core-shell nanowires attractive materials for application to harsh environments. A cell viability study reveals a high degree of biocompatibility of the core-shell nanowires.
authors.affiliation: Computer, Electrical and Mathematical Sciences and Engineering Division (CEMSE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955, Saudi Arabia.
authors.forename: Yurii P
authors.initials: YP
authors.lastname: Ivanov
authors.affiliation: Computer, Electrical and Mathematical Sciences and Engineering Division (CEMSE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955, Saudi Arabia.
authors.forename: Ahmed
authors.initials: A
authors.lastname: Alfadhel
authors.affiliation: Computer, Electrical and Mathematical Sciences and Engineering Division (CEMSE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955, Saudi Arabia.
authors.forename: Mohammed
authors.initials: M
authors.lastname: Alnassar
authors.affiliation: Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955, Saudi Arabia.
authors.forename: Jose E
authors.initials: JE
authors.lastname: Perez
authors.affiliation: Institute of Materials Science of Madrid, CSIC, 28049 Madrid, Spain.
authors.forename: Manuel
authors.initials: M
authors.lastname: Vazquez
authors.affiliation: CIC nanoGUNE Consolider, Av. de Tolosa 76, 20018, San Sebastian, Spain.|IKERBASQUE, Basque Foundation for Science, Maria Diaz de Haro 3, 48013, Bilbao, Spain.
authors.forename: Andrey
authors.initials: A
authors.lastname: Chuvilin
authors.affiliation: Computer, Electrical and Mathematical Sciences and Engineering Division (CEMSE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955, Saudi Arabia.
authors.forename: Jürgen
authors.initials: J
authors.lastname: Kosel
mesh_terms: D007501:Iron / Q000737:chemistry; D060526:Magnetic Fields; D053770:Nanowires / Q000737:chemistry*; D010084:Oxidation-Reduction; D013696:Temperature
chemical_list: D007501:Iron