Magnetic ordering of systems of nanodisks with quenched positional disorder
The effect of positional disorder in systems of single domain ferromagnetic nanodisks placed on a two-dimensional square lattice is studied by Monte Carlo simulations. Nanodisks are treated as magnetic dipoles pointing along one of the two principal axes of the lattice. Disorder is introduced displa...
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| Veröffentlicht in: | Journal of physics. Condensed matter 2011-04, Vol.23 (13), p.136002-7 |
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| container_title | Journal of physics. Condensed matter |
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| creator | Alonso, Juan J Allés, B |
| description | The effect of positional disorder in systems of single domain ferromagnetic nanodisks placed on a two-dimensional square lattice is studied by Monte Carlo simulations. Nanodisks are treated as magnetic dipoles pointing along one of the two principal axes of the lattice. Disorder is introduced displacing each nanodisk by (δx, δy) from its regular lattice position, where δx is randomly chosen within the interval 0 ≤ δx ≤ Δ and analogously for δy. Two different regimes are found: for Δ < Δ(0) = 0.18(2) (in units of lattice spacing) a thermally driven transition between a paramagnetic and a dipolar antiferromagnetic phase with a critical exponent α/ν changing continuously with Δ; for Δ ≥ Δ(0) a paramagnetic phase covering the whole T > 0 range. Plots of the spin-glass overlap parameter versus temperature T or lattice size L seem to exclude an equilibrium spin-glass phase in the latter regime. |
| doi_str_mv | 10.1088/0953-8984/23/13/136002 |
| format | Article |
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Condensed matter</title><addtitle>J Phys Condens Matter</addtitle><description>The effect of positional disorder in systems of single domain ferromagnetic nanodisks placed on a two-dimensional square lattice is studied by Monte Carlo simulations. Nanodisks are treated as magnetic dipoles pointing along one of the two principal axes of the lattice. Disorder is introduced displacing each nanodisk by (δx, δy) from its regular lattice position, where δx is randomly chosen within the interval 0 ≤ δx ≤ Δ and analogously for δy. Two different regimes are found: for Δ < Δ(0) = 0.18(2) (in units of lattice spacing) a thermally driven transition between a paramagnetic and a dipolar antiferromagnetic phase with a critical exponent α/ν changing continuously with Δ; for Δ ≥ Δ(0) a paramagnetic phase covering the whole T > 0 range. 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Condensed matter</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Alonso, Juan J</au><au>Allés, B</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Magnetic ordering of systems of nanodisks with quenched positional disorder</atitle><jtitle>Journal of physics. Condensed matter</jtitle><addtitle>J Phys Condens Matter</addtitle><date>2011-04-06</date><risdate>2011</risdate><volume>23</volume><issue>13</issue><spage>136002</spage><epage>7</epage><pages>136002-7</pages><issn>0953-8984</issn><eissn>1361-648X</eissn><coden>JCOMEL</coden><abstract>The effect of positional disorder in systems of single domain ferromagnetic nanodisks placed on a two-dimensional square lattice is studied by Monte Carlo simulations. Nanodisks are treated as magnetic dipoles pointing along one of the two principal axes of the lattice. 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| subjects | Computer Simulation Condensed matter Condensed matter: electronic structure, electrical, magnetic, and optical properties Disorders Exact sciences and technology Ferromagnetism Lattices Magnetic properties and materials Magnetic properties of nanostructures Magnetics - methods Models, Chemical Monte Carlo Method Nanostructure Nanostructures - chemistry Phase transformations Phase Transition Physics Temperature |
| title | Magnetic ordering of systems of nanodisks with quenched positional disorder |
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