Magnetic properties of Sr0.95Nd0.05Fe12-xScxO19 hexaferrite nanocrystals: (Tcone, H, x) phase diagram. Issue 1 (January 2019)

• Record Type: Journal Article
• Authors: Hilczer, Andrzej; Pasińska, Katarzyna; Andrzejewski, Bartłomiej; Matczak, Michał; Pietraszko, Adam
• Is Part Of: Ceramics international. Volume 45:Issue 1(2019)
• Page Start: 1189
• Page End: 1195
• Publication Date: 2019-01
• Subjects: Hexaferrites -- B. Platelets -- C. Magnetic properties -- D. Functional applications; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.09.303
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Recently conical magnetic order induced by Sc 3+ doping has been reported in ferrimagnetic M-type hexagonal ferrite single- and polycrystals resulting in multiferroic properties of spin origin in bulk material. We were interested in Sc-induced modifications of superexchange interactions in M-hexaferrite nanocrystals since a reduction in size is usually accompanied by degradation in properties important for applications. Nd-stabilized, Sc-doped M-type strontium hexaferrite nanocrystalline powder was obtained by citric sol-gel method. Crystal- and microstructure of Sr0.95 Nd0.05 Fe12-x Scx O19 ( x = 0.60, 0.84, 1.08 1.56) were controlled by X-ray diffraction and scanning electron microscopy. Temperature variation in magnetic hysteresis loops and temperature dependences of magnetization in zero field cooling-field heating experiments were measured from 10 K to 300 K in various magnetic fields. The analysis shows a conical magnetic ordering at low temperatures, below T cone and enabled us to construct the ( T cone, H, x ) phase diagram. Though the effect is similar to that induced by selectively substituted Sc 3+ in the place of ferric ions at the 4f2 and 12k Wyckoff positions in the hexagonal lattice of single and polycrystals the temperatures T cone in nanocrystalline, single domain particles are considerably lower.