Onset of ferromagnetism in Fe epitaxially grown on GaAs(001) (4×2) and (2×6)
Ultrathin Fe films were epitaxially grown at room temperature on GaAs(001) with either predominant (4×2) or (2×6) surface reconstruction. At nominal Fe coverages of tFe⩾2.8 monolayers (ML), a ferromagnetic state is observed below a certain critical temperature, TC. Surprisingly, the magnetic phase t...
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Veröffentlicht in: | Journal of applied physics 2001-06, Vol.89 (11), p.7133-7135 |
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creator | Bensch, F. Garreau, G. Moosbühler, R. Bayreuther, G. Beaurepaire, E. |
description | Ultrathin Fe films were epitaxially grown at room temperature on GaAs(001) with either predominant (4×2) or (2×6) surface reconstruction. At nominal Fe coverages of tFe⩾2.8 monolayers (ML), a ferromagnetic state is observed below a certain critical temperature, TC. Surprisingly, the magnetic phase transition at TC appears even sharper than for Fe films on metallic single-crystal substrates, which were believed to be an excellent representation of two-dimensional (2D) ferromagnets. This may be due to the extremely short lateral length scale of film inhomogeneities. The critical exponent β=0.26 is close to the value expected for 2D XY systems of finite size. For tFe=3.6 ML, TC is close to room temperature. TC decreases steeply with decreasing Fe coverage, with an average slope of 270 K/ML. From a power law extrapolation, TC seems to vanish at tFe=2.5 ML. The onset of ferromagnetism at tFe=2.5 ML is interpreted as a percolation phenomenon during the coalescence process of Fe islands. |
doi_str_mv | 10.1063/1.1361258 |
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At nominal Fe coverages of tFe⩾2.8 monolayers (ML), a ferromagnetic state is observed below a certain critical temperature, TC. Surprisingly, the magnetic phase transition at TC appears even sharper than for Fe films on metallic single-crystal substrates, which were believed to be an excellent representation of two-dimensional (2D) ferromagnets. This may be due to the extremely short lateral length scale of film inhomogeneities. The critical exponent β=0.26 is close to the value expected for 2D XY systems of finite size. For tFe=3.6 ML, TC is close to room temperature. TC decreases steeply with decreasing Fe coverage, with an average slope of 270 K/ML. From a power law extrapolation, TC seems to vanish at tFe=2.5 ML. 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At nominal Fe coverages of tFe⩾2.8 monolayers (ML), a ferromagnetic state is observed below a certain critical temperature, TC. Surprisingly, the magnetic phase transition at TC appears even sharper than for Fe films on metallic single-crystal substrates, which were believed to be an excellent representation of two-dimensional (2D) ferromagnets. This may be due to the extremely short lateral length scale of film inhomogeneities. The critical exponent β=0.26 is close to the value expected for 2D XY systems of finite size. For tFe=3.6 ML, TC is close to room temperature. TC decreases steeply with decreasing Fe coverage, with an average slope of 270 K/ML. From a power law extrapolation, TC seems to vanish at tFe=2.5 ML. The onset of ferromagnetism at tFe=2.5 ML is interpreted as a percolation phenomenon during the coalescence process of Fe islands.</description><subject>CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS</subject><subject>COALESCENCE</subject><subject>CRITICAL TEMPERATURE</subject><subject>EXTRAPOLATION</subject><subject>FERROMAGNETISM</subject><subject>ISLANDS</subject><subject>PHYSICS</subject><subject>SUBSTRATES</subject><issn>0021-8979</issn><issn>1089-7550</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2001</creationdate><recordtype>article</recordtype><recordid>eNotkM1OAjEYRRujiTi68A2auGEWg1__pu2SEEETIhtdN6V0sAZaMm2iPAkPxIuJgdXZ3HsWB6FHAiMCLXsmI8JaQoW6QgMCSjdSCLhGAwBKGqWlvkV3OX8DEKKYHqD3Rcy-4NThzvd92tp19CXkLQ4RTz32u1Dsb7CbzR6v-_QTcYp4Zsd5eDLUeMiPB1pjG1d4SI-Htr5HN53dZP9wYYU-py8fk9dmvpi9TcbzxlEhSiPoClirlw6Y7U6UmnDZeqatkEvpNXBmlaCMK2BMOScIML4ELwnX1nHBKvR09qZcgskuFO--XIrRu2I4UGD6dK1QfV65PuXc-87s-rC1_d4QMP-5DDGXXOwPmZlYaA</recordid><startdate>20010601</startdate><enddate>20010601</enddate><creator>Bensch, F.</creator><creator>Garreau, G.</creator><creator>Moosbühler, R.</creator><creator>Bayreuther, G.</creator><creator>Beaurepaire, E.</creator><general>The American Physical Society</general><scope>AAYXX</scope><scope>CITATION</scope><scope>OTOTI</scope></search><sort><creationdate>20010601</creationdate><title>Onset of ferromagnetism in Fe epitaxially grown on GaAs(001) (4×2) and (2×6)</title><author>Bensch, F. ; Garreau, G. ; Moosbühler, R. ; Bayreuther, G. ; Beaurepaire, E.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c255t-52d0369bc03af69b791476e39a57b7e9043a8523480338cc51034b0e7149ac453</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2001</creationdate><topic>CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS</topic><topic>COALESCENCE</topic><topic>CRITICAL TEMPERATURE</topic><topic>EXTRAPOLATION</topic><topic>FERROMAGNETISM</topic><topic>ISLANDS</topic><topic>PHYSICS</topic><topic>SUBSTRATES</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Bensch, F.</creatorcontrib><creatorcontrib>Garreau, G.</creatorcontrib><creatorcontrib>Moosbühler, R.</creatorcontrib><creatorcontrib>Bayreuther, G.</creatorcontrib><creatorcontrib>Beaurepaire, E.</creatorcontrib><collection>CrossRef</collection><collection>OSTI.GOV</collection><jtitle>Journal of applied physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Bensch, F.</au><au>Garreau, G.</au><au>Moosbühler, R.</au><au>Bayreuther, G.</au><au>Beaurepaire, E.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Onset of ferromagnetism in Fe epitaxially grown on GaAs(001) (4×2) and (2×6)</atitle><jtitle>Journal of applied physics</jtitle><date>2001-06-01</date><risdate>2001</risdate><volume>89</volume><issue>11</issue><spage>7133</spage><epage>7135</epage><pages>7133-7135</pages><issn>0021-8979</issn><eissn>1089-7550</eissn><abstract>Ultrathin Fe films were epitaxially grown at room temperature on GaAs(001) with either predominant (4×2) or (2×6) surface reconstruction. At nominal Fe coverages of tFe⩾2.8 monolayers (ML), a ferromagnetic state is observed below a certain critical temperature, TC. Surprisingly, the magnetic phase transition at TC appears even sharper than for Fe films on metallic single-crystal substrates, which were believed to be an excellent representation of two-dimensional (2D) ferromagnets. This may be due to the extremely short lateral length scale of film inhomogeneities. The critical exponent β=0.26 is close to the value expected for 2D XY systems of finite size. For tFe=3.6 ML, TC is close to room temperature. TC decreases steeply with decreasing Fe coverage, with an average slope of 270 K/ML. From a power law extrapolation, TC seems to vanish at tFe=2.5 ML. The onset of ferromagnetism at tFe=2.5 ML is interpreted as a percolation phenomenon during the coalescence process of Fe islands.</abstract><cop>United States</cop><pub>The American Physical Society</pub><doi>10.1063/1.1361258</doi><tpages>3</tpages></addata></record> |
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subjects | CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS COALESCENCE CRITICAL TEMPERATURE EXTRAPOLATION FERROMAGNETISM ISLANDS PHYSICS SUBSTRATES |
title | Onset of ferromagnetism in Fe epitaxially grown on GaAs(001) (4×2) and (2×6) |
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