The Basis of Nanomagnetism

Guimarães, A.P.

doi:10.1007/978-3-642-01482-6_1

Cited by 42 publications

(62 citation statements)

References 24 publications

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“…The second assumption is met because the thickness of the Py wire is comparable to the Py exchange length 42 and the frequencies of the spin wave eigenmodes discussed in our work are well below the lowest branch of perpendicular standing spin waves (PSSW) 34,43 . The third assumption is met because the wavelength of the excited spin waves along the wire width is long (comparable to the CPS short length ∼10 µm).…”

Section: Theorymentioning

confidence: 99%

Spin wave eigenmodes in transversely magnetized thin film ferromagnetic wires

et al. 2015

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We report experimental and theoretical studies of spin wave eigenmodes in transversely magnetized thin film Permalloy wires. Using broadband ferromagnetic resonance technique, we measure the spectrum of spin wave eigenmodes in individual wires as a function of magnetic field and wire width. Comparison of the experimental data to our analytical model and micromagnetic simulations shows that the intrinsic dipolar edge pinning of spin waves is negligible in transversely magnetized wires. Our data also quantify the degree of extrinsic edge pinning in Permalloy wires. This work establishes the boundary conditions for dynamic magnetization in transversely magnetized thin film wires for the range of wire widths and thicknesses studied, and provides a quantitative description of the spin wave eigenmode frequencies and spatial profiles in this system as a function of the wire width.

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Section: Theorymentioning

confidence: 99%

Spin wave eigenmodes in transversely magnetized thin film ferromagnetic wires

et al. 2015

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“…[1][2][3][4] In general, the magnetic properties of nanoparticles are strongly influenced by changing their size. The static and dynamic magnetic response of a small single-domain magnetic nanoparticle can be considered equivalent to the response of a single large spin, called a macrospin or superspin.…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties, exchange bias, and memory effects in core-shell superparamagnetic nanoparticles of La0.67Sr0.33MnO3

Rostamnejadi

Venkatesan

Salamati

et al. 2017

Journal of Applied Physics

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The static magnetic properties and memory and exchange bias effects have been studied in sol-gel prepared La 0.67 Sr 0.33 MnO 3 (LSMO) nanoparticles. Transmission electron microscopy (TEM) micrographs and static magnetization show log-normal particle and magnetic size distributions with a core-shell structure. Analysis of the magnetization measurements indicates the presence of a magnetic structure with a 7.8 nm core radius and a magnetic dead layer of thickness 1.6 nm in the LSMO nanoparticles, which comprises about 40% of the volume. The disordered spins in the shell freeze at lower temperatures than the core and produce a surface spin glass state exhibiting a weak exchange bias effect. Field cooled and zero-field cooled magnetization measurements have been carried out to study the slow dynamics of the sample and associated magnetic memory effects; the results reveal the superparamagnetic behavior of LSMO nanoparticles described in terms of the magnetic size distribution rather than a superspin glass state. Published by AIP Publishing.

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“…The simulations used a 5 nm mesh, (i.e. comparable to the magnetostatic exchange length [8]) and employed the following magnetic parameters for a (110)-oriented STO substrate [9]: saturation magnetization, Ms = 5.6 x 10 5 A/m; exchange stiffness A = 1.86 x10 -12 J/m; and uniaxial strain anisotropy constant, K U = 1.9 x 10 4 J/m 3 . The Gilbert damping constant was set to α = 0.5 to allow rapid convergence in calculations.…”

Section: Micromagnetic Simulationmentioning

confidence: 99%

Investigating the effect of a stress-based uniaxial anisotropy on the magnetic behaviour of La_0.7Sr_0.3MnO₃elements

O’Shea

Bova

McGrouther

et al. 2014

EPJ Web of Conferences

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Abstract. We investigate the interplay between shape anisotropy and a stress-based uniaxial anisotropy on the magnetic domain structure of La 0.7 Sr 0.3 MnO 3 nanoelements as a function of aspect ratio, using micromagnetic simulations. We show that a direct competition between the anisotropies gives rise to high energy multidomain flux closure configurations, whilst an alignment of the anisotropies can modify the effective element dimensions and act to stabilise a single domain configuration. Our results demonstrate the ability to control the spin state of La 0.7 Sr 0.3 MnO 3 elements in addition to tailoring the domain wall width by controlling the anisotropy of the material, which is key for spintronic applications that require a high spin-polarization and stable magnetic configurations.

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The Basis of Nanomagnetism

Cited by 42 publications

References 24 publications

Spin wave eigenmodes in transversely magnetized thin film ferromagnetic wires

Spin wave eigenmodes in transversely magnetized thin film ferromagnetic wires

Magnetic properties, exchange bias, and memory effects in core-shell superparamagnetic nanoparticles of La0.67Sr0.33MnO3

Investigating the effect of a stress-based uniaxial anisotropy on the magnetic behaviour of La_0.7Sr_0.3MnO₃elements

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The Basis of Nanomagnetism

Cited by 42 publications

References 24 publications

Spin wave eigenmodes in transversely magnetized thin film ferromagnetic wires

Spin wave eigenmodes in transversely magnetized thin film ferromagnetic wires

Magnetic properties, exchange bias, and memory effects in core-shell superparamagnetic nanoparticles of La0.67Sr0.33MnO3

Investigating the effect of a stress-based uniaxial anisotropy on the magnetic behaviour of La0.7Sr0.3MnO3elements

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Investigating the effect of a stress-based uniaxial anisotropy on the magnetic behaviour of La_0.7Sr_0.3MnO₃elements