[20a-D61-1~9] 10.1 Emerging materials in spintronics and magnetics (including fabrication and characterization methodologies)

9:30 AM - 9:45 AM JST(12:30 AM - 12:45 AM UTC)English Presentation

[20a-D61-3] Improved magnetic properties in CoFeB/MgFeO multilayers with Fe segregated interfaces

〇Tomohiro Ichinose¹, Tatsuya Yamamoto¹, Takayuki Nozaki¹, Kay Yakushiji¹, Shingo Tamaru¹, Shinji Yuasa¹ (1.AIST)

Keywords:

magnetic tunnel junction,perpendicular magnetic anisotropy,segregation

We investigated effects of Fe segregation from partially Fe-substituted MgO (MgFeO) on the magnetic properties of CoFeB/MgFeO multilayers. X-ray photoelectron spectroscopy and magnetic measurements revealed that segregated Fe reduced to metallic Fe and ferromagnetism was
exhibited at the CoFeB/MgFeO interface. The CoFeB/MgFeO based multilayers exhibited 1.2 times larger PMA compared with CoFeB/MgO multilayers. Ferromagnetic resonance measurements also revealed a remarkable reduction of magnetic damping in the CoFeB/MgFeO multilayers