Large change of perpendicular magnetic anisotropy in Cobalt ultrathin film induced by varying capping layers

被引：11

作者：

Zhang, Xianmin ^{[1
]}

Mizukami, Shigemi ^{[1
]}

Kubota, Takahide ^{[1
]}

Ma, Qinli ^{[1
]}

Naganuma, Hiroshi ^{[2
]}

Oogane, Mikihiko ^{[2
]}

Ando, Yasuo ^{[2
]}

Miyazaki, Terunobu ^{[1
]}

机构：

[1] Tohoku Univ, WPI Adv Inst Mat Res, Sendai, Miyagi 9808577, Japan

[2] Tohoku Univ, Grad Sch Engn, Dept Appl Phys, Sendai, Miyagi 9808579, Japan

来源：

JOURNAL OF APPLIED PHYSICS | 2012年 / 111卷 / 07期

关键词：

ORGANIC SPIN-VALVE;

D O I：

10.1063/1.3676240

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The magnetic films of Co with Si/SiO2/Pt/Co/molecule structure were fabricated and their structural properties and magnetic anisotropy were investigated by varying both Co (0.5-1.8 nm) thickness and molecular capping layers of 5,6,11,12-tetraphenylnaphthacene (rubrene) and copper phthalocyanine (CuPc), respectively. The crystal structures were characterized using x-ray diffraction (XRD) and the magnetization curves were measured using vibrating sample magnetometer with an applied field both in parallel and perpendicular to a film plane. It was found that the thickness of Co for the maximum perpendicular magnetic anisotropy (PMA) is around 0.7 nm for both group films. However, the estimated effective magnetic anisotropy energy for Co was 2.9 +/- 0.3 x 10(6) erg/cc for rubrene-capped sample, which was smaller than the value of 4.9 +/- 0.4 x 10(6) erg/cc for CuPc-capped sample. The XRD patterns showed the crystal structure of rubrene layer was of amorphous structure and CuPc layer was polycrystalline. The different interface effects of Co/CuPc and Co/rubrene were discussed to analyze the change of PMA. (C) 2012 American Institute of Physics. [doi:10.1063/1.3676240]

引用

页数：3

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