Large enhancement of Blocking temperature by control of interfacial structures in Pt/NiFe/IrMn/MgO/Pt multilayers | Zendy

Xi Chen | Zendy; Shouguo Wang | Zendy; Gang Han | Zendy; Shaolong Jiang | Zendy; Kang Yang | Zendy; Qianqian Liu | Zendy; Jialong Liu | Zendy; Rongming Wang | Zendy; Guanghua Yu | Zendy

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Large enhancement of Blocking temperature by control of interfacial structures in Pt/NiFe/IrMn/MgO/Pt multilayers

Author(s) -

Xi Chen,

Shouguo Wang,

Gang Han,

Shaolong Jiang,

Kang Yang,

Qianqian Liu,

Jialong Liu,

Rongming Wang,

Guanghua Yu

Publication year - 2015

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4931163

Subject(s) - antiferromagnetism , materials science , x ray photoelectron spectroscopy , exchange bias , layer (electronics) , ferromagnetism , texture (cosmology) , transmission electron microscopy , crystallography , analytical chemistry (journal) , condensed matter physics , nanotechnology , chemical engineering , magnetic anisotropy , magnetization , chemistry , magnetic field , chromatography , physics , image (mathematics) , quantum mechanics , artificial intelligence , computer science , engineering

The Blocking temperature (TB) of Pt/NiFe/IrMn/MgO/Pt multilayers was greatly enhanced from far below room temperature (RT) to above RT by inserting 1 nm thick Mg layer at IrMn/MgO interface. Furthermore, the exchange bias field (Heb) was increased as well by the control of interfacial structures. The evidence for a significant fraction of Mn-O bonding at IrMn/MgO interface without Mg insertion layer was provided by X-ray photoelectron spectroscopy. The bonding between Mn and O can decrease the antiferromagnetism of IrMn film, leading to lower value of TB in Pt/NiFe/IrMn/MgO/Pt multilayers. Ultrathin Mg film inserted at IrMn/MgO interface acting as an oxygen sinking layer can suppress the oxidation reactions between Mn and O and reduce the formation of Mn-O bonding greatly. The oxidation suppression results in the recovery of the antiferromagnetism of IrMn film, which can enhance TB and Heb. Furthermore, the high resolution transmission electron microscopy demonstrates that the Mg insertion layer can efficiently promote a high-quality MgO (200) texture. This study will enhance the understanding of physics in antiferromagnet-based spintronic devices

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