Interlayer exchange coupling and magnetoresistance in FM/Os/FM trilayers
Identifieur interne : 000829 ( Main/Exploration ); précédent : 000828; suivant : 000830Interlayer exchange coupling and magnetoresistance in FM/Os/FM trilayers
Auteurs : K. Zanat [Algérie] ; A. Boufelfel [Algérie]Source :
- Journal of physics. Condensed matter : (Print) [ 0953-8984 ] ; 2007.
Descripteurs français
- Pascal (Inist)
English descriptors
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Abstract
We have performed self-consistent calculations to study the interlayer exchange coupling and transport properties of FM/Os/FM trilayers (FM = Co, Fe, FeCo and FePt) as a function of the osmium spacer thickness. Our results are in a good agreement with the published experimental results. The antiferromagnetic (AF) coupling observed experimentally in trilayers where Os spacer thickness was 9-10 Å and where the ferromagnetic slabs were Fe, Co and FeCo verify very well our calculated results. For FePt/Os/FePt, we have attributed the AF coupling peak observed experimentally at a one monolayer (1 ML) Os spacer thickness to our calculated AF coupling at 1 ML in a disordered magnetic layer and, by introducing the effect of the interface roughness in our calculations, we found that the peak is shifted towards 1.5 ML. We fitted our interlayer exchange coupling (IEC) results to an Ruderman-Kittel-Kasuya-Yosida (RKKY) function to the third order to obtain the periods of oscillations and their strengths quantitatively. We have found in a Co/Os/Co trilayer that the values of the oscillation periods of the IEC are 4 and 7 ML; the latter was observed experimentally. Due to the lack of experimental data for the periods of oscillations in FeCo/Os/FeCo, Fe/Os/Fe and FePt/Os/FePt, we compared our results to another method of calculation and found good agreement. An enhancement in the giant magnetoresistance (GMR) is observed for an ordered ferromagnetic slab compared to systems with a disordered ferromagnetic slab.
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Boufelfel</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Physics Laboratory at Guelma, University of Guelma, PO Box 401</s1><s2>Guelma 24000</s2><s3>DZA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Algérie</country><wicri:noRegion>Guelma 24000</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">07-0451222</idno><date when="2007">2007</date><idno type="stanalyst">PASCAL 07-0451222 INIST</idno><idno type="RBID">Pascal:07-0451222</idno><idno type="wicri:Area/PascalFrancis/Corpus">000143</idno><idno type="wicri:Area/PascalFrancis/Curation">000152</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">000149</idno><idno type="wicri:explorRef" wicri:stream="PascalFrancis" wicri:step="Checkpoint">000149</idno><idno type="wicri:doubleKey">0953-8984:2007:Zanat K:interlayer:exchange:coupling</idno><idno type="wicri:Area/Main/Merge">000838</idno><idno type="wicri:Area/Main/Curation">000829</idno><idno type="wicri:Area/Main/Exploration">000829</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Interlayer exchange coupling and magnetoresistance in FM/Os/FM trilayers</title><author><name sortKey="Zanat, K" sort="Zanat, K" uniqKey="Zanat K" first="K." last="Zanat">K. Zanat</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Physics Laboratory at Guelma, University of Guelma, PO Box 401</s1><s2>Guelma 24000</s2><s3>DZA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Algérie</country><wicri:noRegion>Guelma 24000</wicri:noRegion></affiliation></author><author><name sortKey="Boufelfel, A" sort="Boufelfel, A" uniqKey="Boufelfel A" first="A." last="Boufelfel">A. Boufelfel</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Physics Laboratory at Guelma, University of Guelma, PO Box 401</s1><s2>Guelma 24000</s2><s3>DZA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Algérie</country><wicri:noRegion>Guelma 24000</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Journal of physics. Condensed matter : (Print)</title><title level="j" type="abbreviated">J. phys., Condens. matter : (Print)</title><idno type="ISSN">0953-8984</idno><imprint><date when="2007">2007</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of physics. Condensed matter : (Print)</title><title level="j" type="abbreviated">J. phys., Condens. matter : (Print)</title><idno type="ISSN">0953-8984</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Cobalt alloys</term><term>Exchange interactions</term><term>Ferromagnetic materials</term><term>Giant magnetoresistance</term><term>Interfaces</term><term>Iron alloys</term><term>Multilayers</term><term>Oscillations</term><term>Osmium</term><term>Platinum alloys</term><term>RKKY interaction</term><term>Roughness</term><term>Self consistency</term><term>Thickness</term><term>Transition element alloys</term><term>Transport processes</term><term>Ultrathin films</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Interaction échange</term><term>Magnétorésistance géante</term><term>Autocohérence</term><term>Phénomène transport</term><term>Epaisseur</term><term>Interface</term><term>Rugosité</term><term>Interaction RKKY</term><term>Oscillation</term><term>Multicouche</term><term>Fer alliage</term><term>Platine alliage</term><term>Osmium</term><term>Matériau ferromagnétique</term><term>Couche ultramince</term><term>Cobalt alliage</term><term>Métal transition alliage</term><term>Os</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">We have performed self-consistent calculations to study the interlayer exchange coupling and transport properties of FM/Os/FM trilayers (FM = Co, Fe, FeCo and FePt) as a function of the osmium spacer thickness. Our results are in a good agreement with the published experimental results. The antiferromagnetic (AF) coupling observed experimentally in trilayers where Os spacer thickness was 9-10 Å and where the ferromagnetic slabs were Fe, Co and FeCo verify very well our calculated results. For FePt/Os/FePt, we have attributed the AF coupling peak observed experimentally at a one monolayer (1 ML) Os spacer thickness to our calculated AF coupling at 1 ML in a disordered magnetic layer and, by introducing the effect of the interface roughness in our calculations, we found that the peak is shifted towards 1.5 ML. We fitted our interlayer exchange coupling (IEC) results to an Ruderman-Kittel-Kasuya-Yosida (RKKY) function to the third order to obtain the periods of oscillations and their strengths quantitatively. We have found in a Co/Os/Co trilayer that the values of the oscillation periods of the IEC are 4 and 7 ML; the latter was observed experimentally. Due to the lack of experimental data for the periods of oscillations in FeCo/Os/FeCo, Fe/Os/Fe and FePt/Os/FePt, we compared our results to another method of calculation and found good agreement. An enhancement in the giant magnetoresistance (GMR) is observed for an ordered ferromagnetic slab compared to systems with a disordered ferromagnetic slab.</div></front></TEI><affiliations><list><country><li>Algérie</li></country></list><tree><country name="Algérie"><noRegion><name sortKey="Zanat, K" sort="Zanat, K" uniqKey="Zanat K" first="K." last="Zanat">K. Zanat</name></noRegion><name sortKey="Boufelfel, A" sort="Boufelfel, A" uniqKey="Boufelfel A" first="A." last="Boufelfel">A. Boufelfel</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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