TY - JOUR
T1 - Dynamics and collective state of ordered magnetic nanoparticles in mesoporous systems
AU - Vargas, José M.
AU - Srivastava, Abhishek
AU - Garza, Ezra
AU - Yourdkhani, Amin
AU - Caruntu, Gabriel
AU - Spinu, Leonard
N1 - Funding Information:
This work was supported by the National Science Foundation, through the LASiGMA project grants (No. EPS 1003897) and Louisiana Board of Regents Contract No. LEQSF(2007-12)-ENH-PKSFI-PRS-04.
PY - 2012/11/1
Y1 - 2012/11/1
N2 - In this paper we present a study of superparamagnetic and superspin glass states of magnetic nanoparticles confined in mesoporous templates. Characterization utilizes dynamic magnetization techniques, ac susceptibility, and ferromagnetic resonance, in addition to dc magnetization curves. In order to differentiate between the intrinsic and collective properties, we considered three magnetic nanoparticles systems with comparable size, shape, and crystallinity but with different intrinsic magnetocrystalline anisotropy. Further, confinement effects were studied by considering three different geometries of nanoparticles. The effect of the geometrical confinement and intrinsic anisotropy of the nanoparticles are discussed based on known theoretical predictions.
AB - In this paper we present a study of superparamagnetic and superspin glass states of magnetic nanoparticles confined in mesoporous templates. Characterization utilizes dynamic magnetization techniques, ac susceptibility, and ferromagnetic resonance, in addition to dc magnetization curves. In order to differentiate between the intrinsic and collective properties, we considered three magnetic nanoparticles systems with comparable size, shape, and crystallinity but with different intrinsic magnetocrystalline anisotropy. Further, confinement effects were studied by considering three different geometries of nanoparticles. The effect of the geometrical confinement and intrinsic anisotropy of the nanoparticles are discussed based on known theoretical predictions.
UR - http://www.scopus.com/inward/record.url?scp=84870916092&partnerID=8YFLogxK
U2 - 10.1063/1.4764018
DO - 10.1063/1.4764018
M3 - Article
AN - SCOPUS:84870916092
SN - 0021-8979
VL - 112
JO - Journal of Applied Physics
JF - Journal of Applied Physics
IS - 9
M1 - 094309
ER -