The impact of Hf layer thickness on the perpendicular magnetic anisotropy in Hf/CoFeB/MgO/Ta films

Minghua Li, Jinhui Lu, Mustafa Akyol, Xi Chen, Hui Shi, Gang Han, Tong Shi, Guanghua Yu, Ahmet Ekicibil, Nick Kioussis, P. V. Ong, Pedram Khalili Amiri, Kang L. Wang

研究成果: Article同行評審

6 引文 斯高帕斯(Scopus)

摘要

The impact of Hf layer thickness on magnetic anisotropy is evaluated for Hf/CoFeB/MgO/Ta multilayer films commonly used in magnetic tunnel junctions (MTJs). An easy-axis magnetization transition from the in-plane to the out-of-plane direction is observed when the thickness of Hf is greater than ∼1.5 nm in our structure. Moreover, a critical Hf layer thickness exists for strong perpendicular magnetic anisotropy on the CoFeB/MgO interface that maintains the properties required for use in MTJs. We also perform X-ray photoelectron spectroscopy (XPS), high-resolution transmission electron microscopy (HRTEM), and X-ray diffraction (XRD) to study the effects of film composition, chemical states, and crystallization on the magnetic anisotropy in Hf/FeCoB/MgO/Ta multilayers with Hf layers of various thicknesses.

原文English
頁(從 - 到)76-81
頁數6
期刊Journal of Alloys and Compounds
694
DOIs
出版狀態Published - 2017

All Science Journal Classification (ASJC) codes

  • 材料力學
  • 機械工業
  • 金屬和合金
  • 材料化學

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