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10 items by relevance
1 Conference paper

Magnetic properties of clusters

Hendriksen, P.V.; Linderoth, Søren; Lindgård, Per-Anker

Proceedings of the Joint Nordic Spring Meeting '92. Extended Abstracts — 1992

Year: 1992

Language: English

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2 Conference paper

Magnetic properties of clusters

Lindgård, P.-A.; Hendriksen, P.V.

Workshop on Magnetic Structures and Phase Transitions. Abstracts — 1994

Year: 1994

Language: English

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3 Book chapter

Thermal magnetic properties of clusters

Lindgård, P.-A.; Hendriksen, P.V.

New Trends in Magnetism, Magnetic Materials and Their Applications — 1995, pp. 37-46

measurable by neutron scattering. We find an effective power law for the magnetization deviation ΔM(T) ∝ Tα, with α varying smoothly from 3/2 to 3 from the bulk to the smallest clusters, respectively. A non-uniform magnetization profile with rapidly decreasing magnetization of the surface layers evolves

Year: 1995

Language: English

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4 Journal article

Finite-size modifications of the magnetic properties of clusters

Hendriksen, Peter Vang; Linderoth, Søren; Lindgård, Per-Anker

Physical Review B — 1993, Volume 48, Issue 10, pp. 7259-7273

relative to the bulk, and the consequent neutron-scattering cross section exhibits discretely spaced wave-vector-broadened eigenstates. The implications of the finite size on thermodynamic properties, like the temperature dependence of the magnetization and the critical temperature, are also elucidated. We

Year: 1993

Language: English

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5 Journal article

Estimation of electronic and structural influence on the thermal magnetic properties of clusters

Lindgård, P.-A.; Hendriksen, P.V.

Physical Review B — 1994, Volume 49, Issue 17, pp. 12291-12294

Using an effective Heisenberg model for clusters the spin-wave spectrum is calculated by direct diagonalization. The inclusion of a nonuniform magnetization profile at zero temperature, nonuniform exchange interactions as a result of structural relaxations, longer-range interactions

Year: 1994

Language: English

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6 Journal article

Magnetic properties of Heisenberg clusters

Hendriksen, P.V.; Linderoth, Søren; Lindgård, Per-Anker

J. Phys. Condens. Matter — 1993, Volume 5, Issue 31, pp. 5675-5684

The effects of finite size on the thermodynamic properties of ferromagnetic clusters have been calculated on the basis of a self-consistently solved spin-wave spectrum for clusters of various sizes. The finite size leads to an effective power law for the temperature dependence of the magnetization (M approximately Talpha ; 3/2< alpha <3), and to a neutron-scattering cross section with a wavevector broadened discrete spin-wave spectrum very different from that of the bulk. Predictions of the implications of finite size are extended to the size range of nanoparticles. The effects should...

Year: 1993

Language: English

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7 Journal article

Finite-size effects in the magnetic properties of ferromagnetic clusters

Hendriksen, P.V.; Linderoth, S.; Lindgård, P.-A.

Journal of Magnetism and Magnetic Materials — 1992, Volume 104, Issue 104, pp. 1577-1579

Model calculations of the spontaneous magnetization of ferromagnetic clusters of various structures and sizes have been performed. The exchange interaction is modelled with the Heisenberg model, and a self-consistent spin-wave-spectrum is found by direct diagonalization of the equation of motion

Year: 1992

Language: English

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8 Conference paper

Finite-size effects in the magnetic properties of ferromagnetic clusters

Hendriksen, P.V.; Linderoth, Søren; Lindgård, Per-Anker

Journal of Magnetism and Magnetic Materials — 1992, Volume 104/107, pp. 1577-1579

Year: 1992

Language: English

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