Equilibrium and metastable nanoscale domains in ultrathin magnets

Kisielewski, M.; Maziewski, A.; Polyakova, T.; Zablotskii, V.

doi:10.1002/pssc.200563133

Cited by 5 publications

(10 citation statements)

References 19 publications

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“…E for other surfaces is constant and does not depend on the wall orientation. Hence, for [001] and [111] surfaces of a cubic crystal the domain walls are predicted to have no preferential orientation. The results described above give a quantitative measure of the orientation dependent exchange energy loss due to the formation of a domain wall.…”

Section: Exchange Energy: Phenomenological Modelmentioning

confidence: 99%

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Influence of the lattice discreteness on magnetic ordering in nanostructures and nanoarrays

Vedmedenko¹

2007

Physica Status Solidi (b)

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.+ aThe article attempts to analyze the effect of lattice discreteness on the magnetic ordering in nanostructures and nanoarrays. The discussion starts with a basic introduction of the theoretical methods for the description of the magnetic ordering. Next it is shown that the discrete nature of an atomic lattice may lead to the size-driven reorientation of magnetization in nanoparticles, i.e., the magnetization direction can be changed by shrinking the lateral size, keeping the thickness fixed. It is demonstrated that in finite nanomagnets the shape anisotropy can be divided into the discrete and continuum contributions. Then the orientation of magnetic domain walls in low-symmetry objects is discussed. It is shown theoretically that in nanomagnets of monolayer thickness the mechanism of the orientation of domain walls is different from that of bulk systems and is mainly determined by the discreteness of the atomic lattice and the exchange energy. In the last part the theoretical study of magnetostatically interacting nanoarrays is presented. Special attention is paid to the influence of the underlaying lattice symmetry and the higher order multipolar terms on the magnetic ordering. It is demonstrated that the multipole-multipole interactions lead to an enhancement/decrease of the coercivity in arrays with in-plane/out-of-plane magnetization, respectively. In each section of the manuscript the agreement between the theory and recent experimental results is analyzed.

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Section: Exchange Energy: Phenomenological Modelmentioning

confidence: 99%

“…To obtain losses in the exchange energy due to the formation of a domain wall in this model, in a first step projections of all bonds to the axis perpendicular to the plane of the wall ( to[ ] hkl P^) were calculated for single and double layers of (100), (111) and (110) …”

Section: Exchange Energy: Phenomenological Modelmentioning

confidence: 99%

Influence of the lattice discreteness on magnetic ordering in nanostructures and nanoarrays

Vedmedenko¹

2007

Physica Status Solidi (b)

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“…F. Near the wire edge, a sinusoidal‐like domain structure with decaying amplitude exists . The m z (0) amplitude determined at the edge is plotted in Fig.…”

Section: Rpts In Laterally Confined Nanostructuresmentioning

confidence: 99%

Magnetization states and magnetization processes in nanostructures: From a single layer to multilayers

Maziewski

Faßbender

Kisielewski

et al. 2014

Physica Status Solidi (a)

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The results of combined (experimental, analytical, and micromagnetic simulations) studies on the evolution of magnetization states and processes in ultrathin films and multilayered systems are presented. We show ways to manipulate magnetization distributions in ultrathin magnetic single or multilayers by tuning: the thickness of the magnetic layer, the thickness of either the non‐magnetic cap or spacer layer, the magnetic anisotropy, and the geometrical constrictions of the system. In ultrathin magnetic films, both the magnetization distribution and the critical thickness of the magnetization reorientation phase transition (RPT) between perpendicular and in‐plane states can be also controlled by post‐growth treatments, e.g., by either ion or light irradiation. By changing the geometrical parameters of the nanostructure, as well as by an applied external magnetic field, one can tune magnetic domain sizes in a giant range (of a few orders of magnitude) and induce the RPT. Transitions between two‐ and three‐dimensional magnetization distributions are discussed.

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“…In the ultrathin limit, d<l ex (where l ex = ( A/2πM S 2 ) 1/2 is the exchange length, and A is the exchange constant) the domain chemical potential (2) could be written as [13] © 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim www.pss-c.com…”

Section: Thermodynamical Analysis Of Stripe Domain Structuresmentioning

confidence: 99%

“…In [12,13] to describe equilibrium and out-of-equilibrium domains the notion of the domain chemical potential was introduced as µ = dE/dN, where E is the total energy of a domain structure, N is the number of domains in the structure. Using the above defenition of the domain chemical potential and relationship (1), one can obtain the analytical expression for µ:…”

Section: Thermodynamical Analysis Of Stripe Domain Structuresmentioning

confidence: 99%

Temperature‐induced changes of domain structures in ultrathin magnetic films

Polyakova

Zablotskii

2006

Phys. Status Solidi (c)

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We describe the thermal-driven evolution of stripe domain structures in ultrathin magnetic films with perpendicular anisotropy. Taking into account temperature dependencies of the film magnetic parameters we analyze possible temperature dependencies of the domain period. It is shown that the film heating leads to a decrease in the domain period. In soft films thermally assisted domain nucleation could provide a continuous decrease of the domain period while the domain structure passes through equilibrium states. On increasing the temperature of a hard film, the domain structure exists as metastable one adjusting its period by a sequence of jumps towards to equilibrium.

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Equilibrium and metastable nanoscale domains in ultrathin magnets

Cited by 5 publications

References 19 publications

Influence of the lattice discreteness on magnetic ordering in nanostructures and nanoarrays

Influence of the lattice discreteness on magnetic ordering in nanostructures and nanoarrays

Magnetization states and magnetization processes in nanostructures: From a single layer to multilayers

Temperature‐induced changes of domain structures in ultrathin magnetic films

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