The temperature dependence of hysteretic processes in Co nanowires arrays

Astefanoaei, Iordana; Dumitru, Ioan; Diaconu, Andrei; Spînu, Leonard; Stancu, Alexandru

doi:10.1063/1.2837500

Cited by 7 publications

(2 citation statements)

References 8 publications

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“…It could be due to the effect of thermal stress. 12 The remaining disordered fcc FePt phase is associated with the large strain for n ¼ 4 (from HRTEM), which further confirms the strainassisted transformation effect. However, for the sample of n ¼ 20, the strain was partially released and a smaller degree of average strain was applied to the layers (not shown) based on the prestrained growth technique.…”

Section: Multilayer Systemssupporting

confidence: 61%

Packings of Os layers for the development of L10 order of FePt in nanoscale [Os-FePt]n multilayer systems

Hsiao

et al. 2013

Journal of Applied Physics

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The element osmium (Os), with high melting and boiling points, plays a crucial role in the development of the L10 order for FePt in [Os(5 nm)/FePt(25 nm)]4 and [Os(1 nm)/FePt(5 nm)]20 systems. The large mismatches of lattice constants between Os and FePt, with specific epitaxial relations, induce a great strain in the [Os(5 nm) /FePt(25 nm)]4 system with fixed total thicknesses for the FePt and Os layers. Due to this large strain effect, the L10 order in a FePt structure can be enhanced through an application of stressing along the c axis for the face-centered cubic structure, which results in a higher coercivity. However, a smaller degree of average strain was observed in the 5 nm-thickness FePt system due to the existence of pinholes.

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Section: Multilayer Systemssupporting

confidence: 61%

Packings of Os layers for the development of L10 order of FePt in nanoscale [Os-FePt]n multilayer systems

Hsiao

et al. 2013

Journal of Applied Physics

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“…[9][10][11][12] The behaviors of core-shell structures were intensively investigated in order to explain the magnetic properties in various thermal processes. [13][14][15][16][17] The analysis of induced thermal stresses provides information about the magnetic anisotropy, magnetic domains shape, switching mechanism, [17][18][19] etc. The analysis of thermodynamics in the thermal process is an important research topic in the nanoscale dimension.…”

Section: Introductionmentioning

confidence: 99%

Size-dependent thermal stresses in the core—shell nanoparticles

Astefanoaei¹,

Dumitru²,

Al³

2013

Chinese Phys. B

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The thermal stress in a magnetic core—shell nanoparticle during a thermal process is an important parameter to be known and controlled in the magnetization process of the core—shell system. In this paper we analyze the stress that appears in a core—shell nanoparticle subjected to a cooling process. The external surface temperature of the system, considered in equilibrium at room temperature, is instantly reduced to a target temperature. The thermal evolution of the system in time and the induced stress are studied using an analytical model based on a time-dependent heat conduction equation and a differential displacement equation in the formalism of elastic displacements. The source of internal stress is the difference in contraction between core and shell materials due to the temperature change. The thermal stress decreases in time and is minimized when the system reaches the thermal equilibrium. The radial and azimuthal stress components depend on system geometry, material properties, and initial and final temperatures. The magnitude of the stress changes the magnetic state of the core—shell system. For some materials, the values of the thermal stresses are larger than their specific elastic limits and the materials begin to deform plastically in the cooling process. The presence of the induced anisotropy due to the plastic deformation modifies the magnetic domain structure and the magnetic behavior of the system.

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Morphology control of magnetic properties in cobalt nanowires

Yue

et al. 2018

Rare Met.

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The temperature dependence of hysteretic processes in Co nanowires arrays

Cited by 7 publications

References 8 publications

Packings of Os layers for the development of L10 order of FePt in nanoscale [Os-FePt]n multilayer systems

Packings of Os layers for the development of L10 order of FePt in nanoscale [Os-FePt]n multilayer systems

Size-dependent thermal stresses in the core—shell nanoparticles

Morphology control of magnetic properties in cobalt nanowires

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