利用磁控溅射的方法,在室温条件的Si基片上制备了[SmCo(25nm)/Co(x)]4/SmCo(25 nm)多层交换弹性纳米晶复合永磁薄膜(Co层厚度x=0～10 nm),经过550 ℃/20 min的真空退火处理使薄膜结晶后,进行磁性测试和磁耦合分析.结果表明:SmCo层厚度固定为25 nm时,调整Co层的厚度,从0至10 nm逐渐增加,矫顽力从2270.3 kA·m-1逐渐降低至1040.5 kA·m-1,同时,饱和磁化强度和剩磁随Co层厚度增加逐渐增加,上升了60％.当加入10 nm的Co层后,多层膜的最大磁能积比125 nm的单层SmCo薄膜增加了46％.另外,与SmCo/Co双层交换弹性薄膜在退磁过程中表现的零场附近的软硬磁双相行为相比,SmCo/Co多层交换弹性薄膜表现出单相反转行为,说明体系中的两种磁性层具有更好的磁耦合.经过磁耦合研究发现,当Co软磁层较薄时,薄膜中磁性颗粒以颗粒间交换耦合为主；当软磁层厚度增加时,颗粒间交换耦合减弱,静磁耦合增强,保证了软硬磁相之间的良好磁耦合作用.Co层的加入有效地提高了薄膜的磁性能.
参考文献
| [1] | Coehoorn R;de Mooij D;de Waard C .Meltspun permanent magnet materials containing Fe3 B as the main phase[J].Journal of Magnetism and Magnetic Materials,1989,80(01):101. |
| [2] | Kneller E.F.;Hawig R. .The exchange-spring magnet: a new material principle for permanent magnets[J].IEEE Transactions on Magnetics,1991(4):3588-3560. |
| [3] | Zeng H;Li J;Liu J P;Wang Z L,Sun S H .Exchange-coupled nanocomposite magnets by nanoparticle self-assembly[J].Nature,2002,420:395. |
| [4] | Skomski R;Coey J M D .Giant energy product in nanostnuctured two-phase magnets[J].Physical Review B:Condensed Matter,1993,48(21):15812. |
| [5] | Ying Zhang;M. J. Kramer;Debjani Banerjee;Ichiro Takeuchi;J. Ping Liu .Transmission electron microscopy study on Co/Fe interdiffusion in SmCo_(5)/Fe and Sm_(2)Co_(7)/Fe/Sm_(2)Co_(7) thin films[J].Journal of Applied Physics,2011(5):053914-1-053914-4. |
| [6] | Choi Y;Jiang JS;Pearson JE;Bader SD;Liu JP .Origin of recoil hysteresis loops in Sm-Co/Fe exchange-spring magnets[J].Applied physics letters,2007(2):22502-1-22502-3-0. |
| [7] | J. Zhang;Y. K. Takahashi;R. Gopalan;K. Hono .Sm(Co,Cu)_5/Fe exchange spring multilayer films with high energy product[J].Applied physics letters,2005(12):122509.1-122509.3. |
| [8] | Fischer R;Schrefl T;Kronmüller H;Fidler J .Grain-size dependence of remanence and coercive field of isotropic nanocrystalline composite permanent magnets[J].Journal of Magnetism and Magnetic Materials,1996,153(01):35. |
| [9] | Investigation on intergrain exchange coupling of nanocrystalline permanent magnets by Henkel plot[J].Applied physics letters,2003(23):4098-4100. |
| [10] | Chuan-bing Rong;J. Ping Liu .Effect of thermal fluctuations on the recoil loops of SmCo_(5)/Fe nanocomposite system[J].Journal of Applied Physics,2009(7):07A714-1-07A714-3-0. |
| [11] | Gabay A M;Hadjipanayis G C;Marinescu M;Liu J F .Hot-deformed Sm-Co/Co composite magnets fabricated from powder blends[J].Journal of Applied Physics,2010,107(09):09A704. |
| [12] | Fullerton EE;Jiang JS;Rehm C;Sowers CH;Bader SD;Patel JB;Wu XZ;NO ILLINOIS UNIV DEPT PHYS DE KALB IL 60155. .High coercivity, epitaxial Sm-Co films with uniaxial in-plane anisotropy[J].Applied physics letters,1997(11):1579-1581. |
| [13] | Sayama J;Mizutani K;Asahi T;Osaka T .Thin films of SmCo5 with very high perpendicular magnetic anisotropy[J].Applied physics letters,2004(23):5640-5642. |
| [14] | S. Sawatzki;R. Heller;Ch. Mickel;M. Seifert;L. Schultz;V. Neu .Largely enhanced energy density in epitaxial SmCo_(5)/Fe/SmCo_(5) exchange spring trilayers[J].Journal of Applied Physics,2011(12):123922-1-123922-7. |
| [15] | J. Zhou;R. Skomski;Y. Liu;Y. C. Sui;W. Liu;D. J. Sellmyer .Rapidly annealed exchange-coupled Sm-Co/Co multilayers[J].Journal of Applied Physics,2005(10):10K304-1-10K304-3-0. |
| [16] | Krishnan K M .Magnetism and microstructure:the role of interfaces[J].Acta Materialia,1999,47(15):4233. |
| [17] | Kardelky S;Gebert A;Gutfleisch O;Hoffmann V Schultz L .Prediction of the oxidation behaviour of Sm-Co-based magnets[J].Journal of Magnetism and Magnetic Materials,2005,290(part 2):1226. |
| [18] | Lee Z Y;Numata T;Inokuchi S;Sakurai Y .Preparation of SmCo amorphous magnetic film with perpendicular magnetization[J].IEEE Transactions on Magnetics,1984,20(05):1335. |
| [19] | Kelly P.E.;O'Grady K. .Switching mechanisms in cobalt-phosphorus thin films[J].IEEE Transactions on Magnetics,1989(5):3881-3883. |
| [20] | Thamm Stefan;Hesse Jüirgen .A simple plot indicating interactions hetween single-domain particles[J].Journal of Magnetism and Magnetic Materials,1996,154(02):254. |
| [21] | Gabay A M;Marinescu M;Hadjipanayis G C .Enhanced Mr and (BH)max in anisotropic R2Fe14 B/α-Fe composite magnets via inter-granular magnetostatic coupling[J].Journal of Applied Physics,2006,99(08):08B506. |
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