Circular single domains in hemispherical Permalloy nanoclusters

Journal Article · Fri Nov 14 00:00:00 EST 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4901573· OSTI ID:22402630

Araujo, Clodoaldo I. L de,; Fonseca, Jakson M. ^[1]; Sinnecker, João P. ^[2]; Delatorre, Rafael G.; Garcia, Nicolas; Pasa, André A. ^[3]

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1. Departamento de Física, Universidade Federal de Viçosa, 36570-900 Viçosa-MG (Brazil)
2. Centro Brasileiro de Pesquisas Físicas, 22290-180 Rio de Janeiro-RJ (Brazil)
3. Departamento de Física, Universidade Federal de Santa Catarina, 88040-900 Florianópolis-SC (Brazil)

We have studied ferromagnetic Permalloy clusters obtained by electrodeposition on n-type silicon. Magnetization measurements reveal hysteresis loops almost independent on temperature and very similar in shape to those obtained in nanodisks with diameter bigger than 150 nm. The spin configuration for the ground state, obtained by micromagnetic simulation, shows topological vortices with random chirality and polarization. This behavior in the small diameter clusters (∼80 nm) is attributed to the Dzyaloshinskii-Moriya interaction that arises in its hemispherical geometries. This magnetization behavior can be utilized to explain the magnetoresistance measured with magnetic field in plane and out of sample plane.

• OSTI ID: 22402630
• Journal Information: Journal of Applied Physics, Vol. 116, Issue 18; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ELECTRODEPOSITION
GROUND STATES
HYSTERESIS
MAGNETIC FIELDS
MAGNETIZATION
MAGNETORESISTANCE
NANOSTRUCTURES
PERMALLOY
SILICON
SPIN
TOPOLOGY