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            <title xml:lang="en">Modifications of magnetic properties of Pt/Co/Pt thin layers by focused gallium ion beam irradiation</title>
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                <forename type="first">C.</forename>
                <surname>Vieu</surname>
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            <idno type="stamp" n="CNRS">CNRS - Centre national de la recherche scientifique</idno>
            <idno type="stamp" n="UNIV-PSUD">Université Paris Sud - Paris XI</idno>
            <idno type="stamp" n="UNIV-PARIS-SACLAY">Université Paris-Saclay</idno>
            <idno type="stamp" n="UNIV-PSUD-SACLAY" corresp="UNIV-PARIS-SACLAY">Université Paris Sud pour Paris Saclay</idno>
            <idno type="stamp" n="GS-PHYSIQUE">Graduate School Physique</idno>
            <idno type="stamp" n="LPSO">Laboratoire de Physique des Solides d'Orsay</idno>
            <idno type="stamp" n="URP-LPS">Laboratoire de Psychologie Sociale : contextes et régulation</idno>
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                <title xml:lang="en">Modifications of magnetic properties of Pt/Co/Pt thin layers by focused gallium ion beam irradiation</title>
                <author role="aut">
                  <persName>
                    <forename type="first">C.</forename>
                    <surname>Vieu</surname>
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                    <forename type="first">J.</forename>
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                    <forename type="first">H.</forename>
                    <surname>Launois</surname>
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                    <forename type="first">T.</forename>
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                    <forename type="first">P.</forename>
                    <surname>Meyer</surname>
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                    <forename type="first">J.P.</forename>
                    <surname>Jamet</surname>
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                    <forename type="first">J.</forename>
                    <surname>Ferré</surname>
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                    <forename type="first">C.</forename>
                    <surname>Chappert</surname>
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                    <forename type="first">T.</forename>
                    <surname>Devolder</surname>
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                  <idno type="halauthorid">60153-0</idno>
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                  <persName>
                    <forename type="first">V.</forename>
                    <surname>Mathet</surname>
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                  <persName>
                    <forename type="first">H.</forename>
                    <surname>Bernas</surname>
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                <idno type="eissn">1089-7550</idno>
                <title level="j">Journal of Applied Physics</title>
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                  <publisher>American Institute of Physics</publisher>
                  <biblScope unit="volume">91</biblScope>
                  <biblScope unit="issue">5</biblScope>
                  <biblScope unit="pp">3103-3110</biblScope>
                  <date type="datePub">2002</date>
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              <p>We show how the magnetic properties of the Pt/Co ultrathin film structure can be modified and even controlled under uniform irradiation by Ga+ ions at low fluence in the 20-100 keV range. A systematic magneto-optical study is presented for the Pt/Co(1.4 nm)/Pt(111) ultrathin-film structure. At ion fluences below D=1014Ga+/cm2, the coercive field is steadily reduced when increasing the fluence. At large fluences, in the range D=(5-10)×1014Ga+ions/cm2, the magnetization of the Co layer drops rapidly and the film finally becomes paramagnetic at room temperature for D&gt;2×1015Ga+ions/cm2. We demonstrate that these magnetic changes are related to the effect of ion-induced collisional intermixing of the Co/Pt interfaces, leading to the formation of stable Co-Pt alloys with varying composition across the interfaces. A simple model is derived to relate the ion beam-induced mixing to the changes in magnetic properties. The present work allows us to gain a quantitative understanding of previous experiments using a focused Ga+ ion beam to pattern magnetic properties of similar samples at a sub-100 nm scale.</p>
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