Magnetic, Multilayered Nanotubes of Low Aspect Ratios for Liquid Suspensions

Zierold, Robert; Wu, Zhenyu; Biskupek, Johannes; Kaiser, Ute; Bachmann, Julien; Krill, Carl E.; Nielsch, Kornelius

doi:10.1002/adfm.201001395

Cited by 39 publications

(24 citation statements)

References 53 publications

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“…The Verwey temperature T V is in good agreement with previous measurements reported in literature on similar nanostructures. [29][30][31] The SQUID measurements ( Fig. 2(b)) verify the phase transition in the Fe 3 O 4 nanowires and demonstrate that the effects observed in the electrical measurements results exclusively from the magnetite instead of the electrical contacts.…”

mentioning

confidence: 68%

Gate voltage induced phase transition in magnetite nanowires

Gooth¹,

Zierold²,

Gluschke³

et al. 2013

Applied Physics Letters

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mentioning

confidence: 68%

Gate voltage induced phase transition in magnetite nanowires

Gooth¹,

Zierold²,

Gluschke³

et al. 2013

Applied Physics Letters

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“…This might be attributable to the granularity of the iron oxide tube. 15,23 It has been shown analytically that the intrinsic anisotropy of a nanotube can be tailored by tuning the aspect ratio between radius, thickness, and length of the tube, and even be reduced to zero for soft magnetic materials. 22 In the present tube the contribution of the magnetocrystalline anisotropy of the iron oxide (11 000 J/m 3 ) to the intrinsic anisotropy of the tube seems to be comparably high.…”

Section: Resultsmentioning

confidence: 99%

Photoemission electron microscopy of three-dimensional magnetization configurations in core-shell nanostructures

et al. 2011

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We present a photoemission electron microscopy method that combines magnetic imaging of the surface and of the inner magnetization in three-dimensional core-shell nanostructures. The structure investigated consists of a cylindrical nickel core that is completely surrounded by a shell of iron oxide and silicon oxide layers. The method enables one to image the magnetization configuration of the nickel core even though the shell is thicker than the mean-free path of the photoelectrons. Characteristic L 3 and L 2 edges can be observed not only in the yield of the photoelectrons emitted from the surface of the nanostructure but also in its shadow. X-ray magnetic circular dichroism in the electron yield of the x rays absorbed and transmitted by the multilayered nanowire allows for the individual imaging of the magnetization configurations of the iron oxide tube and the nickel core. The method suggests novel approaches for the characterization of the magnetic and material properties of complex three-dimensional nanostructures.

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“…This firstly grown anodic alumina oxide layer was removed by selective chemical etching in 0.2 M CrO 3 and 0.6 M H 3 PO 4 aqueous solution heated at 30–40 °C for 48 h. The samples were then re-anodized for four hours under the same conditions, thus giving rise to the first stage of the patterned template consisting of the narrower segment of the diameter modulated alumina nanopores. Then, a 20 nm thin SiO 2 nanopores coating was deposited by ALD technique [ 42 ], in order to define and fix the diameter of the nanopore’s narrow segment, by depositing the conformal SiO 2 layer that exhibits enhanced resistance to chemical etching processes ( Figure 1 a), as long as the layer thickness is greater than 4–5 nm [ 43 , 44 ]. Non-SiO 2 coated layer prolongation of previously grown nanopores is achieved by re-anodizing the samples under the same conditions for 48 h ( Figure 1 b).…”

Section: Methodsmentioning

confidence: 99%

Effect of Sharp Diameter Geometrical Modulation on the Magnetization Reversal of Bi-Segmented FeNi Nanowires

et al. 2018

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Controlling functional properties of matter and combining them for engineering a functional device is, nowadays, a common direction of the scientific community. For instance, heterogeneous magnetic nanostructures can make use of different types of geometrical and compositional modulations to achieve the control of the magnetization reversal along with the nano-entities and, thus, enable the fabrication of spintronic, magnetic data storage, and sensing devices, among others. In this work, diameter-modulated FeNi nanowires are fabricated paying special effort to obtain sharp transition regions between two segments of different diameters (from about 450 nm to 120 nm), enabling precise control over the magnetic behavior of the sample. Micromagnetic simulations performed on single bi-segmented nanowires predict a double step magnetization reversal where the wide segment magnetization switches near 16 kA/m through a vortex domain wall, while at 40 kA/m the magnetization of the narrow segment is reversed through a corkscrew-like mechanism. Finally, these results are confirmed with magneto-optic Kerr effect measurements at the transition of isolated bi-segmented nanowires. Furthermore, macroscopic vibrating sample magnetometry is used to demonstrate that the magnetic decoupling of nanowire segments is the main phenomenon occurring over the entire fabricated nanowires.

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Magnetic, Multilayered Nanotubes of Low Aspect Ratios for Liquid Suspensions

Cited by 39 publications

References 53 publications

Gate voltage induced phase transition in magnetite nanowires

Gate voltage induced phase transition in magnetite nanowires

Photoemission electron microscopy of three-dimensional magnetization configurations in core-shell nanostructures

Effect of Sharp Diameter Geometrical Modulation on the Magnetization Reversal of Bi-Segmented FeNi Nanowires

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