In:
Advanced Functional Materials, Wiley, Vol. 20, No. 21 ( 2010-11-09), p. 3678-3683
Abstract:
Peapodlike Ni/Ni 3 S 2 chains of about 30 nm in outer diameter, with Ni cores of 10–15 nm, can be synthesized by a sacrificial template route. The Ni 3 S 2 shell exhibits paramagnetic properties with a mass susceptibility of χ ≈ 5 × 10 −5 emu (gOe) −1 , while the ferromagnetic Ni cores show a superparamagnetic behavior with a blocking temperature of T B ≈ 130 K. The shape anisotropy of the chainlike structure is determined as 5.0 × 10 4 J·m −3 , which is larger than the bulk magnetocrystalline anisotropy by one order of magnitude. The demagnetization factor is determined as Δ N = 0.29. The sample provides an ideal structure for studying the magnetization reversal property by the chain‐of‐sphere model. The observations on the formation of the peapod structure verify a growth mechanism of the nanoscale Kirkendall effect. Based on the preparation of peapod chains, a series of nickel sulfide hollow chains with average diameters of 25, 50, and 100 nm are fabricated. In addition, the phase transition for hollow chains from Ni 3 S 2 to NiS is studied.
Type of Medium:
Online Resource
ISSN:
1616-301X
,
1616-3028
DOI:
10.1002/adfm.201001287
Language:
English
Publisher:
Wiley
Publication Date:
2010
detail.hit.zdb_id:
2029061-5
detail.hit.zdb_id:
2039420-2
SSG:
11
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