Measurement of the spin polarization of LaSrMnO

Osofsky, M. S.; Nadgorny, B.; Soulen, R. J.; Broussard, P. R.; Rubinstein, Mark; Byers, J. M.; Laprade, G.; Mukovskiǐ, Ya. M.; Shulyatev, D. A.; Arsenov, A. A.

doi:10.1063/1.369888

Cited by 19 publications

(8 citation statements)

References 9 publications

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“…In this case the spin polarization of the transport electrons is close to 100 % [18][19][20] . The fact that the in-plane lattice parameters of La 2/3 Ca 1/3 MnO 3 and YBa 2 Cu 3 O 7−δ are very similar allows an epitaxial growth of LCMO/YBCO bilayers with structurally sharp interfaces.…”

Section: Introductionmentioning

confidence: 90%

Ferromagnetic/superconducting bilayer structure: A model system for spin diffusion length estimation

Soltan

Albrecht²,

Habermeier³

2004

Phys. Rev. B

105

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We report detailed studies on ferromagnet-superconductor bilayer structures. Epitaxial bilayer structures of half metal-colossal magnetoresistive La 2/3 Ca 1/3 MnO3 (HM-CMR) and high-Tc superconducting YBa2Cu3O 7−δ (HTSC) are grown on SrTiO3 (100) single-crystalline substrates using pulsed laser deposition. Magnetization M (T) measurements show the coexistence of ferromagnetism and superconductivity in these structures at low temperatures. Using the HM-CMR layer as an electrode for spin polarized electrons, we discuss the role of spin polarized self injection into the HTSC layer. The experimental results are in good agreement with a presented theoretical estimation, where the spin diffusion length ξFM is found to be in the range of ξFM ≈ 10 nm.

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Section: Introductionmentioning

confidence: 90%

Ferromagnetic/superconducting bilayer structure: A model system for spin diffusion length estimation

Soltan

Albrecht²,

Habermeier³

2004

Phys. Rev. B

105

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“…The data has been analyzed in terms of the extension to the Blonder, Tinkham, and Klapwijk (BTK) theory developed by Mazin and co-workers. 16 20 Recently it has been shown that this approach may have limitations for certain material systems because the reflection of conduction electrons at an interface between a nonmagnetic metal and ferromagnetic metal can be strongly spin dependent. 21,22 There is also the problem that the model does not take into account spin dependent transport across the barrier.…”

Section: Introductionmentioning

confidence: 99%

“…Spin polarized photoemission measurements determine the bare polarization ͑P͒ of the density of states at E F and P at the free surface of NiMnSb have been reported to be about 50%. 12 Planar NiMnSb/ AlO 3 /Ni 20 Fe 80 tunnel structures were used 13 to estimate the polarization of the tunnel current P m = 28%. Preliminary measurements of transport spin polarization of NiMnSb thin films using the point contact Andreev reflection (PCAR) technique estimate P i = 58%.…”

Section: Introductionmentioning

confidence: 99%

Spin polarization of the transport current at the free surface of bulkNiMnSb

et al. 2004

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The point contact Andreev reflection employing niobium tips was used to determine the degree of transport current spin polarization ͑P t ͒ at the free surface of bulk NiMnSb at 4.2 K. The data was analyzed within the framework of a modified version of the Blonder, Tinkham, and Klapwijk formulism taking into account the two spin polarized channels in the ferromagnet and treating the interface as a planar delta function barrier of height Z between free electron materials. We find that the measured spin polarization is rather insensitive to different surface preparations and magnetic domain structure, and the maximal value of the P t at Z = 0 is 44%, consistent with recent calculations of the surface reconstruction of NiMnSb. Saturation magnetization of the samples was found to be 3.6 B per formula unit indicative of a small amount of atomic disorder.

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“…The low-field magnetoresistance in polycrystalline materials is governed by the spin-polarized transport across grain boundaries. The CMR and extremely high degree of spin polarization [4,5], which are important in exploiting the spin-polarized electron transport, make manganese perovskites preferential candidates for technological applications. In the present work, we investigated the low-field tunnel-type magnetoresistance (MR) characteristics of La 0.7 Pb 0.3 MnO 3 (LPMO) thin films deposited on different substrates, as well as the enhancement of MR property by inserting an intermediate layer.…”

Section: Introductionmentioning

confidence: 99%

Substrate effect on low‐field transport properties of La–Pb–Mn–O granular‐type thin films

Lee

Shim

Kim

2004

Physica Status Solidi (b)

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This paper studied the low-field tunnel-type transport characteristics of polycrystalline and c-axis-oriented La 0.7 Pb 0.3 MnO 3 (LPMO) thin films. Polycrystalline thin films were fabricated on SiO 2 /Si(100) substrate (film A), on SiO 2 /Si substrate with yttria-stabilized zirconia (YSZ) buffer layer (film B), and on c-axisoriented thin film grown on LaAlO 3 (001) (LAO) single crystal substrate (film C) using the soft-chemical deposition method. A YSZ buffer layer acts as a barrier against inter-diffusion. As a result, it decreases the amount of dead layers generated from the interface and helps to produce qualitative films for application of magnetoresistive elements. The magnetoresistance (MR) ratio was 0.52%, 0.7%, and 0.4% for film A, film B, and film C under the applied field of 500 Oe at 300 K, respectively. The polycrystalline film had denser boundaries than the c-axis oriented film, i.e., the polycrystalline film gave more effective potential barrier regions than the c-axis oriented film.

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Measurement of the spin polarization of LaSrMnO

Cited by 19 publications

References 9 publications

Ferromagnetic/superconducting bilayer structure: A model system for spin diffusion length estimation

Ferromagnetic/superconducting bilayer structure: A model system for spin diffusion length estimation

Spin polarization of the transport current at the free surface of bulkNiMnSb

Substrate effect on low‐field transport properties of La–Pb–Mn–O granular‐type thin films

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