Perpendicular magnetic anisotropy of Co\Pt bilayers on ALD HfO2

Abstract

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Electronic voltage control of magnetic anisotropy at room temperature in high- κ SrTiO3/Co/Pt trilayer

“…In previous work [40,41], we argued for reducing the magnetic dead layer thickness to allow a measurable VCMA effect. The thickness of an atomic monolayer of Co fcc (111), for example, is 0.205 nm [55].…”

“…The underlying TiN template layer has a thickness of 9.1 ± 0.5 nm. The Pt and Co layers have a combined thickness of 4.9 ± 0.5 nm; they cannot be distinguished due to interdiffusion [40,43]. This interdiffusion is clearly visible in the energy-dispersive x-ray spectroscopy (EDS) measurement of Fig.…”

“…Given the Co-Pt interdiffusion during anneal, the magnetic stack consists of a CoPtࢨPt bilayer rather than the as-deposited CoࢨPt bilayer. Besides leading to the interdiffusion of Co and Pt, the annealing treatment also leads to recrystallization of the Co layer into the fcc (111) phase [40,43].…”

“…However, no VCMA was detected. The lack of VCMA was ascribed to the thick magnetic dead layer (MDL, t MDL = 0.53 nm [40]) at the a-HfO 2 ࢨferromagnet interface. To improve the quality of the oxideࢨferromagnet interface and minimize t MDL , the aim of this paper is to investigate crystalline SrTiO 3 , and to apply surface cleaning treatments prior to the deposition of the ferromagnetic layer.…”

“…In our recent work, we have shown that perpendicular magnetic anisotropy (PMA) can be obtained in a ferromagnetic film deposited on ALD-grown oxides like amorphous (a-)HfO 2 [40,41]. However, no VCMA was detected.…”