Magnetization Reversal of Nanoscale Islands: How Size and Shape Affect the Arrhenius Prefactor

Krause, Stefan; Herzog, G.; Stapelfeldt, T.; Berbil-Bautista, L.; Bode, Matthias; Vedmedenko, E. Y.; Wiesendanger, R.

doi:10.1103/physrevlett.103.127202

Cited by 99 publications

(109 citation statements)

References 18 publications

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“…The higher range of values was found where the remagnetization occurs via formation of a temporary domain wall ('soliton' mechanism [2]). Experimental estimates for islands falling within a more limited range in shape and size are in close agreement with the calculated values [16]. An HTST estimate for larger permalloy islands used in kagome spin ice systems [17] gave a smaller value, 9.9×10 8 sec −1 [18] while analysis of the experimental data had assumed a value of 10 12 sec −1 [17].…”

Section: Introductionsupporting

confidence: 67%

Thermal stability of magnetic states in submicron magnetic islands

Liashko¹,

Lobanov²,

Uzdin³

et al. 2017

Nanosystems: Phys. Chem. Math.

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The lifetime of magnetic states in single domain micromagnetic islands is calculated within the harmonic approximation to transition state theory. Stable magnetic states, minimum energy paths between them and first order saddle points determining the activation energy are analyzed and visualized on two-dimensional energy surfaces. An analytical expression is derived for the pre-exponential factor in the Arrhenius rate expression for the reversal of the magnetic moment when the external field is directed either along the anisotropy axis or perpendicular to it.

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Section: Introductionsupporting

confidence: 67%

Thermal stability of magnetic states in submicron magnetic islands

Liashko¹,

Lobanov²,

Uzdin³

et al. 2017

Nanosystems: Phys. Chem. Math.

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“…This supports the view that the formation of the SH in Fe-b is driven by a subtle interplay of the exchange interaction acting differently at different spinspin distances. Thermal energy 32 or zero point energy 33 may drive the fluctuation of the phase of the SH, which results in an averaged-out magnetic signal in SP-STM/S at 0 T.…”

Section: Discussionmentioning

confidence: 99%

Reduced-dimensionality-induced helimagnetism in iron nanoislands

et al. 2014

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Low-dimensionality in magnetic materials often leads to noncollinear magnetic order, such as a helical spin order and skyrmions, which have received much attention because of envisioned applications in spin transport and in future data storage. Up to now, however, the real-space observation of the noncollinear magnetic order has been limited mostly to systems involving a strong spin-orbit interaction. Here we report a noncollinear magnetic order in individual nanostructures of a prototypical magnetic material, bilayer iron islands on Cu (111). Spin-polarized scanning tunnelling microscopy reveals a magnetic stripe phase with a period of 1.28 nm, which is identified as a one-dimensional helical spin order. Ab initio calculations identify reduced-dimensionality-enhanced long-range antiferromagnetic interactions as the driving force of this spin order. Our findings point at the potential of nanostructured magnets as a new experimental arena of noncollinear magnetic order stabilized in a nanostructure, magnetically decoupled from the substrate.

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“…The general theory was applied by Néel [2] and subsequently by Brown [21] to small ferromagnetic single-domain grains/nanoparticles. During the last decades these theoretical findings were endorsed by experiments performed at low temperatures in the presence of static magnetic fields [17], ac-magnetic fields [22,23] or spin-polarized currents [24,25]. In the present study we focus on the composite multiferroic structure, depicted in Fig.…”

Section: Introductionmentioning

confidence: 99%

On the superparamagnetic size limit of nanoparticles on a ferroelectric substrate

Sukhov¹,

Chotorlishvili²,

Horley³

et al. 2014

J. Phys. D: Appl. Phys.

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Abstract. When decreasing the size of nanoscale magnetic particles their magnetization becomes vulnerable to thermal fluctuations as approaching the superparamgnetic limit, hindering thus applications relying on a stable magnetization. Here, we show theoretically that a magnetoelectric coupling to a ferroelectric substrate renders possible the realization of substantially smaller nano clusters with thermally stable magnetization. For an estimate of cluster size we perform calculations with realistic material parameters for iron nano particles on ferroelectric BaTiO 3 substrate. We find, steering the polarization of BaTiO 3 with electric fields affects the magnetism of the deposited magnetic clusters. These findings point to a qualitatively new class of superparamagnetic composites.

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Magnetization Reversal of Nanoscale Islands: How Size and Shape Affect the Arrhenius Prefactor

Cited by 99 publications

References 18 publications

Thermal stability of magnetic states in submicron magnetic islands

Thermal stability of magnetic states in submicron magnetic islands

Reduced-dimensionality-induced helimagnetism in iron nanoislands

On the superparamagnetic size limit of nanoparticles on a ferroelectric substrate

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