Microstructural and magnetic properties of CoFeZr films and the tunnel magnetoresistance behaviors of the magnetic tunnel junctions with amorphous CoFeZr ferromagnetic layers

Jin Oh Song, Seong Rae Lee

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We investigated the composition dependence of the microstructure and magnetic properties of Co 90Fe 10-Zr film and the thermal and structural stability of MTJs with CoFeZr layers. As the Zr concentration in the Co 90Fe 10-Zr film increased, the grain size decreased rapidly, and the alloy films became a homogeneous amorphous phase when the concentration of Zr exceeded 15 at%. The TMR ratio of the MTJs with Co 90Fe 10 layers decreased when the samples were annealed at a temperature above 300 °C, whereas that of the MTJs with amorphous CoFeZr layers only started to decrease when they were annealed at a temperature above 350 °C. The MTJs with CoFeZr layers retained a significant TMR value of 28%, even after annealing at 450 °C. The enhanced structural quality of the interfaces improved the thermal stability of the MTJs with amorphous CoFeZr layers.

Original languageEnglish
Pages (from-to)1923-1925
Number of pages3
JournalJournal of Magnetism and Magnetic Materials
Volume310
Issue number2 SUPPL. PART 3
DOIs
Publication statusPublished - 2007 Mar 1

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Tunnel junctions
Magnetoresistance
tunnel junctions
tunnels
Magnetic properties
Tunnels
magnetic properties
thermal stability
Thermodynamic stability
Annealing
structural stability
Temperature
Microstructure
Chemical analysis
grain size
microstructure
annealing
temperature

Keywords

  • Amorphous CoFeZr
  • Microstructure
  • MTJ
  • Stability

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

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title = "Microstructural and magnetic properties of CoFeZr films and the tunnel magnetoresistance behaviors of the magnetic tunnel junctions with amorphous CoFeZr ferromagnetic layers",
abstract = "We investigated the composition dependence of the microstructure and magnetic properties of Co 90Fe 10-Zr film and the thermal and structural stability of MTJs with CoFeZr layers. As the Zr concentration in the Co 90Fe 10-Zr film increased, the grain size decreased rapidly, and the alloy films became a homogeneous amorphous phase when the concentration of Zr exceeded 15 at{\%}. The TMR ratio of the MTJs with Co 90Fe 10 layers decreased when the samples were annealed at a temperature above 300 °C, whereas that of the MTJs with amorphous CoFeZr layers only started to decrease when they were annealed at a temperature above 350 °C. The MTJs with CoFeZr layers retained a significant TMR value of 28{\%}, even after annealing at 450 °C. The enhanced structural quality of the interfaces improved the thermal stability of the MTJs with amorphous CoFeZr layers.",
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AU - Lee, Seong Rae

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N2 - We investigated the composition dependence of the microstructure and magnetic properties of Co 90Fe 10-Zr film and the thermal and structural stability of MTJs with CoFeZr layers. As the Zr concentration in the Co 90Fe 10-Zr film increased, the grain size decreased rapidly, and the alloy films became a homogeneous amorphous phase when the concentration of Zr exceeded 15 at%. The TMR ratio of the MTJs with Co 90Fe 10 layers decreased when the samples were annealed at a temperature above 300 °C, whereas that of the MTJs with amorphous CoFeZr layers only started to decrease when they were annealed at a temperature above 350 °C. The MTJs with CoFeZr layers retained a significant TMR value of 28%, even after annealing at 450 °C. The enhanced structural quality of the interfaces improved the thermal stability of the MTJs with amorphous CoFeZr layers.

AB - We investigated the composition dependence of the microstructure and magnetic properties of Co 90Fe 10-Zr film and the thermal and structural stability of MTJs with CoFeZr layers. As the Zr concentration in the Co 90Fe 10-Zr film increased, the grain size decreased rapidly, and the alloy films became a homogeneous amorphous phase when the concentration of Zr exceeded 15 at%. The TMR ratio of the MTJs with Co 90Fe 10 layers decreased when the samples were annealed at a temperature above 300 °C, whereas that of the MTJs with amorphous CoFeZr layers only started to decrease when they were annealed at a temperature above 350 °C. The MTJs with CoFeZr layers retained a significant TMR value of 28%, even after annealing at 450 °C. The enhanced structural quality of the interfaces improved the thermal stability of the MTJs with amorphous CoFeZr layers.

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