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Emergent ferromagnetism in ZnO/Al2O3 core-shell nanowires: Towards oxide spinterfaces
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10.1063/1.4813217
/content/aip/journal/apl/103/2/10.1063/1.4813217
http://aip.metastore.ingenta.com/content/aip/journal/apl/103/2/10.1063/1.4813217
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Figures

Image of FIG. 1.
FIG. 1.

FESEM images of (a) uncoated ZnO NWs (UZO), (b) ZnO/AlO (AZO), and (c) annealed (A-AZO) core-shell structured NWs. The scale bars are 300 nm. (d) and (e) Corresponding XRD patterns.

Image of FIG. 2.
FIG. 2.

(a) loops of UZO, AZO, and A-AZO NWs measured at 5 and 300 K. (b) Raw data measured on the annealed core-shell nanowire sample A-AZO without subtracting the diamagnetic substrate contribution. The diamagnetic signal of a bare Si substrate is also shown. (c) loops of a control sample of ZnAlO nanocrystals. (d) RT data of as-grown NWs (UZO) and three ZnO/AlO core-shell samples (AZO) with various AlO thickness: 5, 15, and 30 nm. (e) ZFC and FC temperature-dependent magnetization curves of A-AZO and AZO measured in the temperature range of 5–380 K. (f) curve of the A-AZO sample in the extended temperature range of 5–780 K.

Image of FIG. 3.
FIG. 3.

TEM images of individual NWs of (a) the as-grown sample (UZO), (b) after AlO coating (AZO), and (c) the annealed AlO/ZnO core-shell nanowire sample (A-AZO). Insets show the corresponding SAED patterns and HRTEM images. The dashed line in the HRTEM image in (b) marks the AlO/ZnO interface. The thin solid line highlights the boundary of the rough ZnO nanowire core after reacting with the AlO shell. (d) Close-up HRTEM image of an A-AZO NW, showing regions of stacking faults (S.F.) and distorted structures (D.S.) as well as the ZnAlO phase at the interface area.

Image of FIG. 4.
FIG. 4.

(a) Schematic illustration of the epitaxial interface between ZnO and ZnAlO with their atomic crystal structures. (b) Illustration of the concept of producing magnetism in core-shell structured NWs of ZnO core wrapped by ZnAlO/AlO shell. It is noted that the individual components exhibit mainly diamagnetism, but ferromagnetism emerges in nanostructures with engineered “spinterfaces.”

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/content/aip/journal/apl/103/2/10.1063/1.4813217
2013-07-08
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Emergent ferromagnetism in ZnO/Al2O3 core-shell nanowires: Towards oxide spinterfaces
http://aip.metastore.ingenta.com/content/aip/journal/apl/103/2/10.1063/1.4813217
10.1063/1.4813217
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