Effects of Ga substitution on structure and magnetocrystalline anisotropy of Tm2Fe17
Identifieur interne : 002651 ( Main/Exploration ); précédent : 002650; suivant : 002652Effects of Ga substitution on structure and magnetocrystalline anisotropy of Tm2Fe17
Auteurs : Bao-Gen Shen [République populaire de Chine] ; Zhao-Hua Cheng ; Fang-Wei Wang ; Qi-Wei Yan ; Hong Tang [République populaire de Chine] ; Bing Liang [République populaire de Chine] ; Shao-Ying Zhang ; F. R. De Boer [Pays-Bas] ; K. H. J. Buschow ; S. Ridwan [Indonésie]Source :
- Journal of applied physics [ 0021-8979 ] ; 1998-06-01.
Descripteurs français
- Pascal (Inist)
- 7530G, 7560E, 7550T, 7525, 6166D, 7530C, 7540G, 7530K, Etude expérimentale, Thulium alliage, Fer alliage, Gallium alliage, Anisotropie magnétique, Aimantation, Particule magnétique, Structure magnétique, Structure cristalline, Diffraction RX, Diffraction neutron, Susceptibilité magnétique, Dynamique spin, Point Curie, Transition magnétique.
English descriptors
- KwdEn :
Abstract
A detailed investigation of the structure and magnetic properties of Tm2Fe17-xGax (x=0, 1, 2, 3, 4, 5, 6, 7, and 8) compounds has been performed by means of x-ray-diffraction, neutron-diffraction, magnetization, and ac-susceptibility measurements. Crystal-structure studies have shown that the prepared samples are single phase with the hexagonal Th2Ni17 for x≤3 and the rhombohedral Th2Zn17 structure for x≥5. In Tm2Fe13Ga4 the Th2Zn17 structure coexists with the Th2Ni17 structure. Substitution of Ga for Fe in Tm2Fe17 leads to an increase of the unit-cell volume, which is linear with the Ga concentration. In Tm2Fe17-xGax, the saturation magnetization at 1.5 K decreases linearly with increasing Ga content with a rate of 2.3 μB per substituted Ga atom. The Curie temperature is found first to increase with increasing Ga content, going through a maximum value of 485 K at about x=3, then to decrease. Between x=6 and 7, a minimum value of TC is reached and for higher x values TC increases again. X-ray-diffraction measurements on magnetically aligned Tm2Fe17-xGax powders show that the compounds with x≤6 have an easy-plane type of magnetic anisotropy, whereas the compounds with x≥7 exhibit easy c-axis anisotropy at room temperature. All Tm2Fe17-xGax compounds exhibit a spin-reorientation transition at low temperature, except for the sample with x=6, which shows an easy-magnetization direction perpendicular to the c axis in the temperature range from 5 to 300 K. For x≤5, the spin-reorientation temperature is found first to increase with x and then to decrease, having a maximum value of 211 K at about x=3. In the samples with x≥7, an easy-plane anisotropy was observed at low temperature, but an easy-axis preference of the magnetization at room temperature was observed. The results obtained for Tm2Fe17-xGax indicate that the mutually competing Tm- and Fe-sublattice anisotropies both change their sign with increasing Ga concentration. © 1998 American Institute of Physics.
Affiliations:
- Indonésie, Pays-Bas, République populaire de Chine
- Hollande-Septentrionale
- Amsterdam
- Université d'Amsterdam
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R." last="De Boer">F. R. De Boer</name><affiliation wicri:level="4"><inist:fA14 i1="04"><s1>Van der Waals-Zeeman Institute, University of Amsterdam, Valckenierstraat 65, 1018 XE Amsterdam, The Netherlands</s1><sZ>8 aut.</sZ></inist:fA14><country xml:lang="fr">Pays-Bas</country><wicri:regionArea>Van der Waals-Zeeman Institute, University of Amsterdam, Valckenierstraat 65, 1018 XE Amsterdam</wicri:regionArea><wicri:noRegion>1018 XE Amsterdam</wicri:noRegion><orgName type="university">Université d'Amsterdam</orgName><placeName><settlement type="city">Amsterdam</settlement><region>Hollande-Septentrionale</region></placeName></affiliation></author><author><name sortKey="Buschow, K H J" sort="Buschow, K H J" uniqKey="Buschow K" first="K. H. J." last="Buschow">K. H. J. Buschow</name></author><author><name sortKey="Ridwan, S" sort="Ridwan, S" uniqKey="Ridwan S" first="S." last="Ridwan">S. Ridwan</name><affiliation wicri:level="1"><inist:fA14 i1="05"><s1>Material Science Research Center, National Atomic Energy Agency, Kawasan PUSPIPTEK, Serpong, Tangerang, Indonesia</s1><sZ>10 aut.</sZ></inist:fA14><country xml:lang="fr">Indonésie</country><wicri:regionArea>Material Science Research Center, National Atomic Energy Agency, Kawasan PUSPIPTEK, Serpong, Tangerang</wicri:regionArea><wicri:noRegion>Tangerang</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Journal of applied physics</title><title level="j" type="abbreviated">J. appl. phys.</title><idno type="ISSN">0021-8979</idno><imprint><date when="1998-06-01">1998-06-01</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of applied physics</title><title level="j" type="abbreviated">J. appl. phys.</title><idno type="ISSN">0021-8979</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Crystal structure</term><term>Curie point</term><term>Experimental study</term><term>Gallium alloys</term><term>Iron alloys</term><term>Magnetic anisotropy</term><term>Magnetic particles</term><term>Magnetic structure</term><term>Magnetic susceptibility</term><term>Magnetic transitions</term><term>Magnetization</term><term>Neutron diffraction</term><term>Spin dynamics</term><term>Thulium alloys</term><term>XRD</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>7530G</term><term>7560E</term><term>7550T</term><term>7525</term><term>6166D</term><term>7530C</term><term>7540G</term><term>7530K</term><term>Etude expérimentale</term><term>Thulium alliage</term><term>Fer alliage</term><term>Gallium alliage</term><term>Anisotropie magnétique</term><term>Aimantation</term><term>Particule magnétique</term><term>Structure magnétique</term><term>Structure cristalline</term><term>Diffraction RX</term><term>Diffraction neutron</term><term>Susceptibilité magnétique</term><term>Dynamique spin</term><term>Point Curie</term><term>Transition magnétique</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">A detailed investigation of the structure and magnetic properties of Tm<sub>2</sub>Fe<sub>17-x</sub>Ga<sub>x</sub> (x=0, 1, 2, 3, 4, 5, 6, 7, and 8) compounds has been performed by means of x-ray-diffraction, neutron-diffraction, magnetization, and ac-susceptibility measurements. Crystal-structure studies have shown that the prepared samples are single phase with the hexagonal Th<sub>2</sub>Ni<sub>17</sub> for x≤3 and the rhombohedral Th<sub>2</sub>Zn<sub>17</sub> structure for x≥5. In Tm<sub>2</sub>Fe<sub>13</sub>Ga<sub>4</sub> the Th<sub>2</sub>Zn<sub>17</sub> structure coexists with the Th<sub>2</sub>Ni<sub>17</sub> structure. Substitution of Ga for Fe in Tm<sub>2</sub>Fe<sub>17</sub> leads to an increase of the unit-cell volume, which is linear with the Ga concentration. In Tm<sub>2</sub>Fe<sub>17-x</sub>Ga<sub>x</sub>, the saturation magnetization at 1.5 K decreases linearly with increasing Ga content with a rate of 2.3 μ<sub>B</sub> per substituted Ga atom. The Curie temperature is found first to increase with increasing Ga content, going through a maximum value of 485 K at about x=3, then to decrease. Between x=6 and 7, a minimum value of T<sub>C</sub> is reached and for higher x values T<sub>C</sub> increases again. X-ray-diffraction measurements on magnetically aligned Tm<sub>2</sub>Fe<sub>17-x</sub>Ga<sub>x</sub> powders show that the compounds with x≤6 have an easy-plane type of magnetic anisotropy, whereas the compounds with x≥7 exhibit easy c-axis anisotropy at room temperature. All Tm<sub>2</sub>Fe<sub>17-x</sub>Ga<sub>x</sub> compounds exhibit a spin-reorientation transition at low temperature, except for the sample with x=6, which shows an easy-magnetization direction perpendicular to the c axis in the temperature range from 5 to 300 K. For x≤5, the spin-reorientation temperature is found first to increase with x and then to decrease, having a maximum value of 211 K at about x=3. In the samples with x≥7, an easy-plane anisotropy was observed at low temperature, but an easy-axis preference of the magnetization at room temperature was observed. The results obtained for Tm<sub>2</sub>Fe<sub>17-x</sub>Ga<sub>x</sub> indicate that the mutually competing Tm- and Fe-sublattice anisotropies both change their sign with increasing Ga concentration. © 1998 American Institute of Physics.</div></front></TEI><affiliations><list><country><li>Indonésie</li><li>Pays-Bas</li><li>République populaire de Chine</li></country><region><li>Hollande-Septentrionale</li></region><settlement><li>Amsterdam</li></settlement><orgName><li>Université d'Amsterdam</li></orgName></list><tree><noCountry><name sortKey="Buschow, K H J" sort="Buschow, K H J" uniqKey="Buschow K" first="K. H. J." last="Buschow">K. H. J. Buschow</name><name sortKey="Cheng, Zhao Hua" sort="Cheng, Zhao Hua" uniqKey="Cheng Z" first="Zhao-Hua" last="Cheng">Zhao-Hua Cheng</name><name sortKey="Wang, Fang Wei" sort="Wang, Fang Wei" uniqKey="Wang F" first="Fang-Wei" last="Wang">Fang-Wei Wang</name><name sortKey="Yan, Qi Wei" sort="Yan, Qi Wei" uniqKey="Yan Q" first="Qi-Wei" last="Yan">Qi-Wei Yan</name><name sortKey="Zhang, Shao Ying" sort="Zhang, Shao Ying" uniqKey="Zhang S" first="Shao-Ying" last="Zhang">Shao-Ying Zhang</name></noCountry><country name="République populaire de Chine"><noRegion><name sortKey="Shen, Bao Gen" sort="Shen, Bao Gen" uniqKey="Shen B" first="Bao-Gen" last="Shen">Bao-Gen Shen</name></noRegion><name sortKey="Liang, Bing" sort="Liang, Bing" uniqKey="Liang B" first="Bing" last="Liang">Bing Liang</name><name sortKey="Tang, Hong" sort="Tang, Hong" uniqKey="Tang H" first="Hong" last="Tang">Hong Tang</name></country><country name="Pays-Bas"><region name="Hollande-Septentrionale"><name sortKey="De Boer, F R" sort="De Boer, F R" uniqKey="De Boer F" first="F. R." last="De Boer">F. R. De Boer</name></region></country><country name="Indonésie"><noRegion><name sortKey="Ridwan, S" sort="Ridwan, S" uniqKey="Ridwan S" first="S." last="Ridwan">S. Ridwan</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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