Abstract
A method was reported by which the effective anisotropy of the Fe-SiO/sub 2/ and Fe/sub 20/Ni/sub 80/-SiO/sub 2/ granular solid can be measured using the magnetic relaxation equations. The pure Fe-SiO/sub 2/ and Fe/sub 20/Ni/sub 80/-SiO/sub 2/ granular solid samples were fabricated using a sol-gel method in which the nanoscale bcc structure Fe and fcc structure Fe/sub 20/Ni/sub 80/ particles are dispersed in the silica matrix. The average size of the metal particles in the two discussed Fe-SiO/sub 2/ and Fe/sub 20/Ni/sub 80/-SiO/sub 2/ granular solid samples are 10 nm and 8 nm, respectively. The obtained values of the effective magnetic anisotropy are in the order of the 10/sup 6/ erg/cm/sup 3/ and almost independent with temperature from 80 K to 300 K for these granular solid samples. These values are far larger than the magnetocrystalline anisotropy for the bulk bcc structure Fe and fcc structure Fe/sub 20/Ni/sub 80/. The larger stress magnetic anisotropy may result in these larger magnetic anisotropy for these granular solid samples. It was found that the effective magnetic anisotropy of the Fe-SiO/sub 2/ granular solid is larger than that of the Fe/sub 20/Ni/sub 80/-SiO/sub 2/ granular solid, which may result from the larger stress anisotropy in Fe-SiO/sub 2/ granular solid than in Fe/sub 20/Ni/sub 80/-SiO/sub 2/ granular solid and the reason is discussed.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
