Submonolayer Magnetism of Fe(110) on W(110): Finite Width Scaling of Stripes and Percolation between Islands

Elmers, H. J.; Hauschild, J.; Hoche, Holger; Gradmann, U.; Bethge, H.; Heuer, D.; Köhler, Ulrich

doi:10.1103/physrevlett.73.898

Cited by 327 publications

(221 citation statements)

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“…The Ising model, which is an infinite uniaxial anisotropic model, then becomes suitable for investigating ferromagnetic thin-films. This Ising model has been proved useful where many theoretical [26,27] and experimental works [28][29][30] have confirmed that the magnetic behavior in thin-films structure has the Ising universality. Consequently, the Ising model was then considered in this work to investigate the ferromagnetic ordering and its critical behavior in ultra-thin-film structure.…”

Section: Stretchable Ising Hamiltonian and Monte Carlo Proceduresmentioning

confidence: 87%

Monte Carlo Investigation of Spatially Adaptable Magnetic Behavior in Stretchable Uniaxial Ferromagnetic Monolayer Film

Laosiritaworn¹,

Laosiritaworn²

2015

Journal of Magnetics

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In this work, Monte Carlo simulation was employed to model the stretchable Ising monolayer film to investigate the effect of the spatial distance variation among magnetic atoms on magnetic behavior of the film. The exchange interaction was considered as functions of initial interatomic distance and the stretched distance (or the strain). Following Bethe-Slater picture, the magnetic exchange interaction took the Lennard-Jones potential-like function. Monte Carlo simulations via the Wolff and Metropolis algorithms were used to update the spin systems, where equilibrium and dynamic magnetic profiles were collected. From the results, the strain was found to have strong influences on magnetic behavior, especially the critical behavior. Specifically, the phase transition point was found to either increase or decrease depending on how the exchange interaction shifts (i.e. towards or away from the maximum value). In addition, empirical functions which predict how the critical temperatures scale with initial interatomic distance and the strain were proposed, which provides qualitatively view how to fine tune the magnetic critical point in monolayer film using the substrate modification induced strain.

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Section: Stretchable Ising Hamiltonian and Monte Carlo Proceduresmentioning

confidence: 87%

Monte Carlo Investigation of Spatially Adaptable Magnetic Behavior in Stretchable Uniaxial Ferromagnetic Monolayer Film

Laosiritaworn¹,

Laosiritaworn²

2015

Journal of Magnetics

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“…The magnetism of thin iron, nickel and cobalt films differs strongly from the behavior of the bulk materials [1][2][3] . Quantities like the Curie temperature 4 and the magnetic anisotropies 5 show thickness dependent characteristics.…”

Section: Introductionmentioning

confidence: 99%

Scanning tunneling spectroscopy of Ni/W(110): bcc and fcc properties in the second atomic layer

Schöneberg

Berndt

2013

Appl. Phys. A

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Nickel islands are grown on W(110) at elevated temperatures. Islands with a thickness of two layers are investigated with scanning tunneling microscopy. Spectroscopic measurements reveal that nanometer sized areas of the islands exhibit distinctly different apparent heights and dI/dV spectra. Spin polarized and paramagnetic band structure calculations indicate that the spectral features are due to fcc(111) and bcc(110) orientations of the Ni film, respectively.

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“…[1][2][3][4] From the point of view of statistical mechanics, ferromagnetism is characterized by a singular Curie temperature T c , below which there is long-range ferromagnetic order. In a strict sense, there is no ferromagnetism in nature, since the magnets' finite size inhibits ferromagnetic long-range order in a thermodynamic sense.…”

Section: Introductionmentioning

confidence: 99%

“…For example, isotropic nanocrystalline permanent magnets are actually random-anisotropy spin glasses, in spite of their often very high coercivity. 5 In this theoretical paper we investigate the superparamagnetism of inhomogeneous films such as sesquilayer Fe/ W͑110͒ consisting of second-layer islands on a monolayer background 2,3,6 and submonolayer fcc iron on flat and vicinal Cu͑111͒ surfaces, which form triangles and stripes, respectively. 7…”

Section: Introductionmentioning

confidence: 99%

Superparamagnetic ultrathin films

Skomski

Sander

Shen

et al. 1997

Journal of Applied Physics

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The finite-temperature magnetism of ultrathin films such as sesquilayer Fe/W͑110͒ and submonolayer Fe/Cu͑111͒ is investigated. Based on renormalizations of Onsager's exact solution of the two-dimensional Ising model it is shown that superparamagnetism is a common phenomenon in imperfect ultrathin films. The ultimate reason for this behavior is the existence of two structural length scales: the lattice constant, usually considered in renormalization-group theory, and the characteristic size of the film inhomogeneities.

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Submonolayer Magnetism of Fe(110) on W(110): Finite Width Scaling of Stripes and Percolation between Islands

Cited by 327 publications

References 20 publications

Monte Carlo Investigation of Spatially Adaptable Magnetic Behavior in Stretchable Uniaxial Ferromagnetic Monolayer Film

Monte Carlo Investigation of Spatially Adaptable Magnetic Behavior in Stretchable Uniaxial Ferromagnetic Monolayer Film

Scanning tunneling spectroscopy of Ni/W(110): bcc and fcc properties in the second atomic layer

Superparamagnetic ultrathin films

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