Size dependence of magnetic properties of permalloy microstripe arrays

We present an investigation of different thin-film evaporated ferromagnetic materials for their suitability as electrodes in individual single-wall and multi-wall carbon nanotube-based spin devices. Various electrode shapes made from permalloy ͑Ni 81 Fe 19 ͒, the diluted ferromagnet PdFe, and PdFe/Fe bilayers are studied for both their micromagnetic properties and their contact formation to carbon nanotubes. Suitable devices are tested in low-temperature electron transport measurements, displaying the typical tunneling magnetoresistance of carbon nanotube pseudo-spin valves.

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“…[16][17][18] From the homogeneity of the entire Py strip in Fig. 2͑a͒ it can be concluded that the observed segment is in a single domain state.…”

Section: Permalloymentioning

confidence: 83%

“…Permalloy (Py) was a chosen as a ferromagnetic material for its high magnetic permeability, low coercive field, and large magnetic anisotropy. 16,17,18 From the homogeneity of the entire Py strip in Fig. 2(a) it can be concluded that the observed segment is in a single domain state.…”

Section: Permalloymentioning

confidence: 88%

Characterization of ferromagnetic contacts to carbon nanotubes

Preusche

Schmidmeier

Pallecchi

et al. 2009

Journal of Applied Physics

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“…Further increase in a recording density requires magnetic patterns smaller below the order of micrometer. Magnetic properties of micrometer sized permalloy dots and wires are well studied so far [4,5]. However, the magnetic properties strongly depend on the size and the shape especially for nanometer sized magnetic materials.…”

Section: Introductionmentioning

confidence: 99%

Relationship Between Coercivity and Magnetic Domain Structure for Permalloy Thin Film

Tanaka

Matsuzaki

Kurisu

et al. 2009

Trans. Mat. Res. Soc. Japan

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Relationship between coercivity and micromagnetic structure was estimated using a micromagnetic simulator assuming permalloy film as a magnetic film. Wire-like shaped magnetic film showed relatively high coercivity and the magnetization reversed thorough coherent rotation. Coercivity was found to relate to the micromagnetic structure, and large sized film tends to configure vortex micromagnetic structure and coercivity becomes small.

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