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Perpendicular magnetic anisotropy induced by a cap layer in ultrathin MgO/CoFeB/Nb
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10.1063/1.4742195
/content/aip/journal/jap/112/3/10.1063/1.4742195
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/3/10.1063/1.4742195
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) Magnetization vs. external field along both in-plane and perpendicular directions as a function of x in Sub/Ta/MgO/CoFeB/Nb (x = 1–2.5 nm) films. (b) The same results as (a) but with low-filed scales.

Image of FIG. 2.
FIG. 2.

Effective anisotropy constant (Keff) vs. the thickness of the Nb cap layer in Sub/Ta/MgO/CoFeB/Nb (x = 1–2.5 nm) films. The inset shows the remanence and coercivity extracted from Fig. 1 . The PMA clearly only occurs within a window of the cap layer thickness of 1.2–2.5 nm.

Image of FIG. 3.
FIG. 3.

Effective anisotropy constant (Keff) vs. the thickness of Ta and Ru in Sub/Ta/MgO/CoFeB/cap (cap = Ta or Ru) films. The Ta series shows a similar effect of Nb in that Keff > 0 only occurs within a small window of <3.5 nm, while Ru shows a weaker effect and Keff remains negative.

Image of FIG. 4.
FIG. 4.

Ki of Sub/Ta/MgO/CoFeB/cap (cap = Nb and Ta) as a function of the cap layer thickness.

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/content/aip/journal/jap/112/3/10.1063/1.4742195
2012-08-06
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Perpendicular magnetic anisotropy induced by a cap layer in ultrathin MgO/CoFeB/Nb
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/3/10.1063/1.4742195
10.1063/1.4742195
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