Current distribution inside Py/Cu lateral spin-valve devices

J. Hamrle, T. Kimura, Y. Otani, K. Tsukagoshi, Y. Aoyagi

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

We have investigated experimentally the nonlocal voltage signal (NLVS) in the lateral Permalloy (Py)/Cu/Py spin-valve devices with different width of Cu stripes. We found that NLVS strongly depends on the distribution of the spin-polarized current inside Cu strip in the vicinity of the Py detector. To explain these data we have developed a diffusion model describing spatial (three dimensional) distribution of the spin-polarized current in the device. The results of our calculations show that NLVS is decreased by a factor of 10 due to spin flip scattering occurring at the Py/Cu interface. The interface resistivity on the Py/Cu interface is also present, but its contribution to reduction of NLVS is minor. We also found that most of the spin-polarized current is injected within the region 30 nm from the Py injector/Cu interface. In the area at Py detector/Cu interface, the spin-polarized current is found to flow mainly close on the injector side, with 1/e exponential decay in the magnitude within the distance 80 nm.

Original languageEnglish
Article number094402
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume71
Issue number9
DOIs
Publication statusPublished - Mar 1 2005

Fingerprint

Permalloys (trademark)
current distribution
Electric potential
Detectors
electric potential
injectors
Scattering
detectors
strip
electrical resistivity
decay
scattering

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Current distribution inside Py/Cu lateral spin-valve devices. / Hamrle, J.; Kimura, T.; Otani, Y.; Tsukagoshi, K.; Aoyagi, Y.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 71, No. 9, 094402, 01.03.2005.

Research output: Contribution to journalArticle

@article{e1685f8c3ab449d69292e595a6432d04,
title = "Current distribution inside Py/Cu lateral spin-valve devices",
abstract = "We have investigated experimentally the nonlocal voltage signal (NLVS) in the lateral Permalloy (Py)/Cu/Py spin-valve devices with different width of Cu stripes. We found that NLVS strongly depends on the distribution of the spin-polarized current inside Cu strip in the vicinity of the Py detector. To explain these data we have developed a diffusion model describing spatial (three dimensional) distribution of the spin-polarized current in the device. The results of our calculations show that NLVS is decreased by a factor of 10 due to spin flip scattering occurring at the Py/Cu interface. The interface resistivity on the Py/Cu interface is also present, but its contribution to reduction of NLVS is minor. We also found that most of the spin-polarized current is injected within the region 30 nm from the Py injector/Cu interface. In the area at Py detector/Cu interface, the spin-polarized current is found to flow mainly close on the injector side, with 1/e exponential decay in the magnitude within the distance 80 nm.",
author = "J. Hamrle and T. Kimura and Y. Otani and K. Tsukagoshi and Y. Aoyagi",
year = "2005",
month = "3",
day = "1",
doi = "10.1103/PhysRevB.71.094402",
language = "English",
volume = "71",
journal = "Physical Review B - Condensed Matter and Materials Physics",
issn = "1098-0121",
publisher = "American Physical Society",
number = "9",

}

TY - JOUR

T1 - Current distribution inside Py/Cu lateral spin-valve devices

AU - Hamrle, J.

AU - Kimura, T.

AU - Otani, Y.

AU - Tsukagoshi, K.

AU - Aoyagi, Y.

PY - 2005/3/1

Y1 - 2005/3/1

N2 - We have investigated experimentally the nonlocal voltage signal (NLVS) in the lateral Permalloy (Py)/Cu/Py spin-valve devices with different width of Cu stripes. We found that NLVS strongly depends on the distribution of the spin-polarized current inside Cu strip in the vicinity of the Py detector. To explain these data we have developed a diffusion model describing spatial (three dimensional) distribution of the spin-polarized current in the device. The results of our calculations show that NLVS is decreased by a factor of 10 due to spin flip scattering occurring at the Py/Cu interface. The interface resistivity on the Py/Cu interface is also present, but its contribution to reduction of NLVS is minor. We also found that most of the spin-polarized current is injected within the region 30 nm from the Py injector/Cu interface. In the area at Py detector/Cu interface, the spin-polarized current is found to flow mainly close on the injector side, with 1/e exponential decay in the magnitude within the distance 80 nm.

AB - We have investigated experimentally the nonlocal voltage signal (NLVS) in the lateral Permalloy (Py)/Cu/Py spin-valve devices with different width of Cu stripes. We found that NLVS strongly depends on the distribution of the spin-polarized current inside Cu strip in the vicinity of the Py detector. To explain these data we have developed a diffusion model describing spatial (three dimensional) distribution of the spin-polarized current in the device. The results of our calculations show that NLVS is decreased by a factor of 10 due to spin flip scattering occurring at the Py/Cu interface. The interface resistivity on the Py/Cu interface is also present, but its contribution to reduction of NLVS is minor. We also found that most of the spin-polarized current is injected within the region 30 nm from the Py injector/Cu interface. In the area at Py detector/Cu interface, the spin-polarized current is found to flow mainly close on the injector side, with 1/e exponential decay in the magnitude within the distance 80 nm.

UR - http://www.scopus.com/inward/record.url?scp=20344392150&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=20344392150&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.71.094402

DO - 10.1103/PhysRevB.71.094402

M3 - Article

AN - SCOPUS:20344392150

VL - 71

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

SN - 1098-0121

IS - 9

M1 - 094402

ER -