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首页> 外文期刊>Physical review >Formation of Co nanodisc with enhanced perpendicular magnetic anisotropy driven by Ga~+ ion irradiation on Pt/Co/Pt films
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Formation of Co nanodisc with enhanced perpendicular magnetic anisotropy driven by Ga~+ ion irradiation on Pt/Co/Pt films

机译：在Pt / Co / Pt薄膜上通过Ga〜+离子辐照形成具有增强的垂直磁各向异性的Co纳米盘

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The origin of magnetic phase transition from in-plane to perpendicular magnetic anisotropy (PMA) of Pt/Co/Pt thin film by Ga~(+) ion irradiation at fluences of 1-5 × 10~(15) ions/cm~2 is investigated by means of x-ray magnetic circular dichroism (XMCD) and extended x-ray absorption fine structure (EXAFS) analyses. We find that Pt and Co atoms are mixed with each other and that Co is oxidized near the surface due to removal of the Pt overlayer. Furthermore, polarization-dependent EXAFS analysis shows that Co is firstly dispersed as separated single-atom-thick sheets in a Pt matrix at 1 x 10~(15) ions/cm~2, then the Co sheets are divided into a few A clusters at 5 × 10~(15) ions/cm~2, which are regarded as nanodiscs parallel to the film plane. This process is accompanied by the appearance of an out-of-plane magnetization component and a remanence peak is observed. Because we do not observe an enhancement in anisotropy of Co orbital moment which leads to change in magnetic anisotropy through the transition at about 5 × 10~(15) ions/cm~2, it might be possible that such nanodisc formation induces increase of magnetic anisotropy via a shape effect. By comparing with the phase transition observed at lower fluence [Phys. Rev. B 86, 024418 (2012)], we find that the mechanism of two transitions is different, i.e., the transition at lower fluence is caused by anisotropy of orbital moment due to structural strain, while the present transition is possibly by shape effect due to nanodisc formation.
机译：1-5×10〜（15）ions / cm〜2的注量下Ga〜（+）离子辐照使Pt / Co / Pt薄膜的面内磁各向异性转变为垂直磁各向异性（PMA）通过X射线磁性圆二色性（XMCD）和扩展X射线吸收精细结构（EXAFS）分析进行了研究。我们发现Pt和Co原子相互混合，并且由于Pt覆盖层的去除，Co在表面附近被氧化。此外，偏振相关的EXAFS分析表明，Co首先以1 x 10〜（15）离子/ cm〜2的形式分散成单原子厚的片状散布在Pt基质中，然后将Co片分为几个A簇。以5×10〜（15）离子/ cm〜2的速率，被认为是平行于薄膜平面的纳米圆盘。该过程伴随有面外磁化分量的出现，并且观察到剩磁峰。因为我们没有观察到Co轨道矩各向异性的增加，该各向异性会导致磁各向异性通过约5×10〜（15）离子/ cm〜2的跃迁发生变化，所以这种纳米圆盘的形成可能引起磁的增加。通过形状效应实现各向异性。通过与在较低注量下观察到的相变进行比较[Phys。 Rev. B 86，024418（2012）]，我们发现两个跃迁的机理是不同的，即较低通量的跃迁是由于结构应变引起的轨道矩各向异性引起的，而目前的跃迁可能是由于形状效应由于纳米光盘的形成。

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  • 来源
    《Physical review》 |2016年第17期|174422.1-174422.8|共8页
  • 作者

    M. Sakamaki; K. Amemiya; I. Sveklo; P. Mazalski; M. O. Liedke; J. Fassbender; Z. Kurant; A. Wawro; A. Maziewski;

  • 作者单位

    Photon Factory and Condensed Matter Research Center, Institute of Materials Structure Science,High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan;

    Photon Factory and Condensed Matter Research Center, Institute of Materials Structure Science,High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan;

    University of Bialystok, Ciolkowskiego 1L, Bialystok 15-245, Poland;

    University of Bialystok, Ciolkowskiego 1L, Bialystok 15-245, Poland,Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, 30-239 Krakow, Poland;

    Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany;

    Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany;

    University of Bialystok, Ciolkowskiego 1L, Bialystok 15-245, Poland;

    Institute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, PL02668 Warsaw, Poland;

    University of Bialystok, Ciolkowskiego 1L, Bialystok 15-245, Poland;

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