High Bulk Spin Scattering Asymmetry in CPP Spin Valves With Alternated Monatomic $[\\hbox {Fe/Co}]_{\\rm n}$ Superlattice

Author

Mano, Tomonori ; Chu, In Chang ; Miyake, Kousaku ; Doi, Masaaki ; Kuwano, Satoko ; Shima, Toshiyuki ; Sahashi, Masashi

Author_Institution

Dept. of Electron. Eng., Tohoku Univ., Sendai, Japan

Volume

45

Issue

10

fYear

2009

Firstpage

3460

Lastpage

3463

Abstract

We confirmed the structural properties of trilayered epitaxial films with AML [Fe/Co]_n and Au spacer on Au electrode by RHEED and TEM. A considerably large DeltaRA (2.61 mOmegamum²) resistance area product was observed in all metallic current perpendicular-to-plane giant magneto-resistance (CPP-GMR) spin-valve elements by using alternate monatomic epitaxial [Fe/Co]_n ferromagnetic layer with IrMn layer on the top. The estimated spin scattering asymmetry coefficient beta and interface asymmetry coefficient gamma was 0.81 and 0.43 plusmn 0.05, respectively. This value of beta is higher than that of Fe₅₀Co₅₀/Cu laminated with Cu spacer or Heusler alloy which is largest value ever reported at room temperature.

Keywords

cobalt; electrodes; ferromagnetic materials; giant magnetoresistance; gold; iridium alloys; iron; magnetic epitaxial layers; magnetic multilayers; manganese alloys; reflection high energy electron diffraction; spin valves; transmission electron microscopy; Heusler alloy; RHEED; TEM; [Fe-Co]_n-IrMn-Au; alternate monatomic epitaxial ferromagnetic layer; gold electrode; high bulk spin scattering asymmetry; interface asymmetry coefficient; metallic current perpendicular-plane giant magnetoresistance spin-valves; monatomic superlattice; room temperature; spin scattering asymmetry coefficient; temperature 293 K to 298 K; trilayered epitaxial film structural properties; Alternate monatomic layer; epitaxial superlattice; giant magnetoresistance; spin scattering asymmetry; spin-valves;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2009.2022022

Filename

5257071

High Bulk Spin Scattering Asymmetry in CPP Spin Valves With Alternated Monatomic Superlattice

Mano, Tomonori ; Chu, In Chang ; Miyake, Kousaku ; Doi, Masaaki ; Kuwano, Satoko ; Shima, Toshiyuki ; Sahashi, Masashi

jour

High Bulk Spin Scattering Asymmetry in CPP Spin Valves With Alternated Monatomic $[\\hbox {Fe/Co}]_{\\rm n}$ Superlattice