Magnetic anisotropy variations and nonequilibrium tunneling in a cobalt nanoparticle - art. no. 226801

Citation
Mm. Deshmukh et al., Magnetic anisotropy variations and nonequilibrium tunneling in a cobalt nanoparticle - art. no. 226801, PHYS REV L, 8722(22), 2001, pp. 6801
Citations number
17
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
0031-9007 → ACNP
Volume
8722
Issue
22
Year of publication
2001
Database
ISI
SICI code
0031-9007(20011126)8722:22<6801:MAVANT>2.0.ZU;2-U
Abstract
We present detailed measurements of the discrete electron-tunneling level s pectrum within nanometer-scale cobalt particles as a function of magnetic f ield and gate voltage, in this way probing individual quantum many-body eig enstates inside ferromagnetic samples. Variations among the observed levels indicate that different quantum states within one particle are subject to different magnetic anisotropy energies. Gate-voltage studies demonstrate th at the low-energy tunneling spectrum is affected dramatically by the presen ce of nonequilibrium spin excitations.