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首页> 外文期刊>Journal of Vacuum Science & Technology >Nanostructure and magnetic properties of c-axis oriented L10-FePt,nanoparticles and nanocrystalline films on polycrystalline TiN underlayers
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Nanostructure and magnetic properties of c-axis oriented L10-FePt,nanoparticles and nanocrystalline films on polycrystalline TiN underlayers

机译：多轴TiN底层上c轴取向的L10-FePt，纳米粒子和纳米晶体薄膜的纳米结构和磁性

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摘要

We performed a systematic study of the nanostructure and magnetic properties of FePt on templates of either (200)-oriented polycrystalline TiN underlayers with in-plane grain sizes from 5.8 to 10 nm (poly-TiN) or highly (200)-textured TiN underlayers epitaxially grown on single-crystalline MgO (100) substrates (epi-TiN). For small nominal FePt thicknesses (0.7-8.0 nm), FePt forms particulate films with the magnetic easy axis perpendicular to the film plane on every template TiN underlayer. In addition, the coercivity of nominally 1.4-nm-thick FePt at 300 K in the out-of-plane direction increases from 5.3 kOe for 5.8-nm-sized poly-TiN to 12.9 kOe for 10-nm-sized poly-TiN and reaches 16.3 kOe for epi-TiN, which shows that the coercivity strongly depends on the degree of the c-axis orientation. For larger FePt nominal thicknesses (16-64 nm), FePt particles percolate and form continuous films, and the direction of the easy magnetic easy axis becomes random. The coercivity of nominally 64-nm-thick FePt at 300 K in the out-of-plane direction is still as large as 8.8 kOe for 10-nm-sized poly-TiN, but it drastically decreases to 0.5 kOe for epi-TiN. The absence of in-plane texture in the FePt layer on the poly-TiN suppresses the decrease in coercivity, which prevents domain-wall displacement.
机译：我们对面内晶粒尺寸为5.8至10 nm（poly-TiN）或高度（200）织构化的TiN底层的（200）取向多晶TiN底层的模板进行了FePt纳米结构和磁性能的系统研究外延生长在单晶MgO（100）衬底（epi-TiN）上。对于较小的FePt标称厚度（0.7-8.0 nm），FePt会在每个模板TiN底层上形成磁易轴垂直于膜平面的颗粒膜。此外，在300 K时，名义上厚度为1.4 nm的FePt的矫顽力从平面外方向的5.8 kOe增加到5.8 nm的多TiN的12.9 kOe，而10 nm的多TiN和Epi-TiN达到16.3 kOe，这表明矫顽力很大程度上取决于c轴取向的程度。对于较大的FePt标称厚度（16-64 nm），FePt颗粒会渗透并形成连续膜，并且易磁易轴的方向变得随机。对于10nm尺寸的聚TiN，在面外方向300 K处名义上64nm厚的FePt的矫顽力仍然高达8.8 kOe，但对于Epi-TiN，矫顽力急剧下降至0.5 kOe。聚TiN上的FePt层中不存在面内织构会抑制矫顽力的降低，从而防止畴壁位移。

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  • 来源
    《Journal of Vacuum Science & Technology》 |2011年第3期|p.031801.1-031801.10|共10页
  • 作者

    Yoshiko Tsuji; Suguru Noda; Shinichi Nakamura;

  • 作者单位

    Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku,Tokyo 113-8656, Japan;

    Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku,Tokyo 113-8656, Japan;

    Center for Instrumental Analysis, Aoyama Gakuin University, 5-10-1 Fuchinobe, Sagamihara, Kanagawa 229-8558, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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