The role of the crystal orientation (<i>c</i>-axis) on switching field distribution and the magnetic domain configuration in electrodeposited hcp Co–Pt nanowires

Arshad, Muhammad Shahid; Proença, Mariana P.; Trafela, Špela; Neu, V.; Wolff, Ulrike; Stienen, Sven; Vázquez, M.; Kobe, Spomenka; Rožman, Kristina Žužek

doi:10.1088/0022-3727/49/18/185006

Cited by 2 publications

(1 citation statement)

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“…Consequently, even geometrically simple cylindrical magnetic nanowires (NWs) of magnetic materials with strong perpendicular magnetocrystalline anisotropy have been shown to exhibit a rich phase diagram of magnetic configurations ranging from uniform magnetization to longitudinal and transverse (multi-)domain states, depending on diameter, length, aspect ratio, externally applied field, and magnetic history of the NW. [19][20][21][22][23][24] Cylindrical magnetic CoNi NWs with a hexagonal close-packed (hcp) crystal structure oriented with their c-axis close to perpendicular to the NW axis are a prominent member of this class, which may be additionally tuned such to also display face-centered cubic (fcc) crystal structure with weaker crystalline anisotropy. [25][26][27][28][29] Previous experimental studies have revealed the existence of (A) a remanent longitudinal vortex state stabilized through the application of a longitudinal external field and/or moderate Ni-to-Co content ratio, and, more recently, (B) a multi-vortex/multi-transverse domain state stabilized by the application of a transverse field and/or low Ni-to-Co content ratio.…”

Section: Introductionmentioning

confidence: 99%

Field tunable three-dimensional magnetic nanotextures in cobalt-nickel nanowires

Andersen

Wolf

Rodríguez

et al. 2021

Phys. Rev. Research

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Cylindrical magnetic nanowires with large transversal magnetocrystalline anisotropy have been shown to sustain non-trivial magnetic configurations resulting from the interplay of spatial confinement, exchange, and anisotropies. Exploiting these peculiar 3D spin configurations and their solitonic inhomogeneities are prospected to improve magnetization switching in future spintronics, such as power-saving magnetic memory and logic applications. Here we employ holographic vector-field electron tomography to reconstruct the remanent magnetic states in CoNi nanowires with 10 nm resolution in 3D, with a particular focus on domain walls between remanent states and ubiquitous realstructure effects stemming from irregular morphology and anisotropy variations. By tuning the applied magnetic field direction, both longitudinal and transverse multi-vortex states of different chiralities and peculiar 3D features such as shifted vortex cores are stabilized. The chiral domain wall between the longitudinal vortices of opposite chiralities exhibits a complex 3D shape characterized by a push out of the central vortex line and a gain in exchange and anisotropy energy. A similar complex 3D texture, including bent vortex lines, forms at the domain boundary between transverse-vortex states and longitudinal configurations. Micromagnetic simulations allow an understanding of the origin of the observed complex magnetic states.

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