Enhancement of magnetoresistance using CoFe/Ru/CoFe synthetic ferrimagnetic pinned layer in BiFeO{sub 3} based spin-valves

Journal Article · Mon Aug 13 00:00:00 EDT 2012 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4745504· OSTI ID:22089365

Naganuma, Hiroshi; Kubota, Miho; Inami, Nobuhito; Kawada, Yuki; Oogane, Mikihiko; Ando, Yasuo ^[1]; Bae, In-Tae ^[2]; Miyazaki, Takamichi ^[3]; Mizukami, Shigemi ^[4]; Han, X. F. ^[5]

---

1. Department of Applied Physics, Graduate School of Engineering, Tohoku University, 6-6-05 Aoba Aramaki Aoba-ku, Sendai 980-8579 (Japan)
2. Small Scale Systems Integration and Packaging Center, State University of New York at Binghamton, Binghamton, New York 13902 (United States)
3. Tohoku University, Department of Instrumental Analysis, 6-6-11 Aoba, Aramaki, Aoba, Sendai 980-8579 (Japan)
4. WPI Advanced Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577 (Japan)
5. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China)

SrTiO{sub 3} (100) sub/BiFeO{sub 3}/CoFe/Ru/CoFe/Cu/CoFe/Ta structure was prepared by a combination of chemical solution deposition and sputtering method, and followed by a systematical investigation for the structural, magnetic and magnetoresistance properties at room temperature (RT) as a function of CoFe and Ru thicknesses. It was revealed that introduction of synthetic CoFe/Ru/CoFe as a pinning layer increased the giant magentoresistance (MR) ratio to 8.3% at RT. This enhancement of MR ratio might be attributed to (i) the increase of pinning field, and (ii) suppression of the influence of the surface roughness of BiFeO{sub 3} by inserting the synthetic CoFe/Ru/CoFe layer.

• OSTI ID: 22089365
• Journal Information: Applied Physics Letters, Vol. 101, Issue 7; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COBALT ALLOYS
COPPER
CRYSTAL STRUCTURE
DEPOSITION
FERRIMAGNETIC MATERIALS
INTERFACES
IRON ALLOYS
LAYERS
MAGNETISM
MAGNETORESISTANCE
ROUGHNESS
RUTHENIUM
SPIN
SPUTTERING
SURFACES
TANTALUM
TEMPERATURE RANGE 0273-0400 K
THICKNESS
THIN FILMS