All-metallic lateral spin valves using Co2Fe(Ge0.5Ga0.5) Heusler alloy with a large spin signal

Takahashi, Y. K.; Kasai, S.; Hirayama, S.; Mitani, S.; Hono, K.

doi:doi:10.1063/1.3681804

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Magnetostructural phase transitions and magnetocaloric effects in MnNiGe_1−xAl_x

The thermomagnetic and magnetocaloric properties of the MnNiGe1−xAlx system have been investigated by magnetization and differential scanning calorimetry (DSC) measurements. The presence of first-order magnetostructural transitions (MSTs) from hexagonal ferromagnetic to orthorhombic antiferromagnetic phases has been detected for x = 0.085 and 0.09 at 193 K and 186 K, respectively. The values of latent heat (L = 6.6 J/g) and corresponding total entropy changes (ΔST = 35 J/kg K) have been evaluat...

Dipolar ordering of random two-dimensional spin ensemble

We theoretically study the randomly positioned two-dimensional system of interacting magnetic dipoles representing the monolayer arrays of single-domain particles. It is showed the onset of the dipolar in-plane superferromagnetic ordering of Ising spins at the surface concentrations of nanoparticles above 0.24. The critical concentration of particles with random easy axis arrangement at zero temperature is 0.65. It is demonstrated that the ensemble with Ising arrangement of spins is ordered at ...

A large spin signal (ΔR_s) of 12.8 mΩ at room temperature is demonstrated in an all-metallic lateral spin valve (LSV) device comprising of ferromagnetic wire of a highly spin-polarized Co₂Fe(Ge_0.5Ga_0.5) Heusler alloy and a Cu wire. From the results on multi-terminal LSV devices, the origin of the large ΔR_s was concluded to be the high spin polarization of Co₂Fe(Ge_0.5Ga_0.5) and the resultant small spin absorption. The all-metallic LSV device without MgO barrier has low contact resistance, which is considered to be beneficial for a high frequency ultrathin read sensor for the next generation ultrahigh density magnetic recording.

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KEYWORDS, PACS, and IPC

Keywords

cobalt alloys, contact resistance, ferromagnetic materials, gallium alloys, germanium alloys, iron alloys, spin valves

PACS

75.47.Np

Metals and alloys
73.40.Cg

Contact resistance, contact potential

International Patent Classification (IPC)

C22C38/00
Ferrous alloys, e.g. steel alloys
C22C19/00
Alloys based on nickel or cobalt
H01L27/20
Including piezo-electric components; Including electrostrictive components; Including magnetostrictive components
H01L27/22
Including components using galvano-magnetic effects, e.g. hall effect; Using similar magnetic field effects
H01L41/00
Piezo-electric elements in general; Electrostrictive elements in general; Magnetostrictive elements in general; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
H01L43/00
Devices using galvano-magnetic or similar magnetic effects; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof

ARTICLE DATA

Digital Object Identifier

http://dx.doi.org/10.1063/1.3681804

PUBLICATION DATA

ISSN

0003-6951 (print)

1077-3118 (online)

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$abstract.society.value is a Member of CrossRef

American Institute of Physics

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