Site-dependent cobalt electronic state in La–Co co-substituted magnetoplumbite-type ferrite: 59Co nuclear magnetic resonance study. (29th June 2016)

• Record Type: Journal Article
• Authors: Nakamura, Hiroyuki; Shimoda, Aiko; Waki, Takeshi; Tabata, Yoshikazu; Mény, Christian
• Is Part Of: Journal of physics. Volume 28:Number 34(2016)
• Publication Date: 2016-06-29
• Subjects: ferrite magnet -- SrFe12O19 -- nuclear magnetic resonance -- low-spin cobalt; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/0953-8984/28/34/346002
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: The nuclear magnetic resonance of 59 Co was measured over a wide frequency range in a powder sample crushed from a well-characterized single crystal of La–Co co-substituted magnetoplumbite-type strontium ferrite (SrFe12 O19 ), a familiar base material for the ferrite permanent magnet. The simultaneous observation of both high- and low-frequency resonances suggests the coexistence of both high- and low-spin states of the substituted Co or the presence of Co orbital moment at a particular site. The possible presence of trivalent Co was also investigated. The results suggest that the Co atoms are distributed across different crystallographic sites with different local environments, and that the electronic state of Co is much more subtle than the conventional understanding.