Nanopillar spin filter tunnel junctions with manganite barriers

Bhagwati Prasad; Mehmet Egilmez; Frank Schoofs; Thomas Fix; Mary E. Vickers; Wenrui Zhang; Jie Jian; Haiyan Wang; Mark G. Blamire

doi:10.1021/nl500798b

Nanopillar spin filter tunnel junctions with manganite barriers

Bhagwati Prasad^*
, Mehmet Egilmez
, Frank Schoofs
, Thomas Fix
, Mary E. Vickers
, Wenrui Zhang
, Jie Jian
, Haiyan Wang
, Mark G. Blamire

^*Corresponding author for this work

University of Cambridge
Texas A&M University

Research output: Contribution to journal › Article › peer-review

20 Scopus citations

Abstract

The potential of a manganite ferromagnetic insulator in the field of spin-filtering has been demonstrated. For this, an ultrathin film of Sm _0.75Sr_0.25MnO₃ is integrated as a barrier in an epitaxial oxide nanopillar tunnel junction and a high spin polarization of up to 75% at 5 K has been achieved. A large zero-bias anomaly observed in the dynamic conductance at low temperatures is explained in terms of the Kondo scattering model. In addition, a decrease in spin polarization at low bias and hysteretic magneto-resistance at low temperatures are reported. The results open up new possibilities for spin-electronics and suggest exploration of other manganites-based materials for the room temperature spin-filter applications.

Original language	English
Pages (from-to)	2789-2793
Number of pages	5
Journal	Nano Letters
Volume	14
Issue number	5
DOIs	https://doi.org/10.1021/nl500798b
State	Published - 14 May 2014
Externally published	Yes

Keywords

Kondo effect
Spin filter
manganites
nanopillar
tunnel barrier

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10.1021/nl500798b

Cite this

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title = "Nanopillar spin filter tunnel junctions with manganite barriers",

abstract = "The potential of a manganite ferromagnetic insulator in the field of spin-filtering has been demonstrated. For this, an ultrathin film of Sm 0.75Sr0.25MnO3 is integrated as a barrier in an epitaxial oxide nanopillar tunnel junction and a high spin polarization of up to 75\% at 5 K has been achieved. A large zero-bias anomaly observed in the dynamic conductance at low temperatures is explained in terms of the Kondo scattering model. In addition, a decrease in spin polarization at low bias and hysteretic magneto-resistance at low temperatures are reported. The results open up new possibilities for spin-electronics and suggest exploration of other manganites-based materials for the room temperature spin-filter applications.",

keywords = "Kondo effect, Spin filter, manganites, nanopillar, tunnel barrier",

author = "Bhagwati Prasad and Mehmet Egilmez and Frank Schoofs and Thomas Fix and Vickers, \{Mary E.\} and Wenrui Zhang and Jie Jian and Haiyan Wang and Blamire, \{Mark G.\}",

year = "2014",

month = may,

day = "14",

doi = "10.1021/nl500798b",

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volume = "14",

pages = "2789--2793",

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TY - JOUR

T1 - Nanopillar spin filter tunnel junctions with manganite barriers

AU - Prasad, Bhagwati

AU - Egilmez, Mehmet

AU - Schoofs, Frank

AU - Fix, Thomas

AU - Vickers, Mary E.

AU - Zhang, Wenrui

AU - Jian, Jie

AU - Wang, Haiyan

AU - Blamire, Mark G.

PY - 2014/5/14

Y1 - 2014/5/14

N2 - The potential of a manganite ferromagnetic insulator in the field of spin-filtering has been demonstrated. For this, an ultrathin film of Sm 0.75Sr0.25MnO3 is integrated as a barrier in an epitaxial oxide nanopillar tunnel junction and a high spin polarization of up to 75% at 5 K has been achieved. A large zero-bias anomaly observed in the dynamic conductance at low temperatures is explained in terms of the Kondo scattering model. In addition, a decrease in spin polarization at low bias and hysteretic magneto-resistance at low temperatures are reported. The results open up new possibilities for spin-electronics and suggest exploration of other manganites-based materials for the room temperature spin-filter applications.

AB - The potential of a manganite ferromagnetic insulator in the field of spin-filtering has been demonstrated. For this, an ultrathin film of Sm 0.75Sr0.25MnO3 is integrated as a barrier in an epitaxial oxide nanopillar tunnel junction and a high spin polarization of up to 75% at 5 K has been achieved. A large zero-bias anomaly observed in the dynamic conductance at low temperatures is explained in terms of the Kondo scattering model. In addition, a decrease in spin polarization at low bias and hysteretic magneto-resistance at low temperatures are reported. The results open up new possibilities for spin-electronics and suggest exploration of other manganites-based materials for the room temperature spin-filter applications.

KW - Kondo effect

KW - Spin filter

KW - manganites

KW - nanopillar

KW - tunnel barrier

UR - https://www.scopus.com/pages/publications/84900519286

U2 - 10.1021/nl500798b

DO - 10.1021/nl500798b

M3 - 文章

AN - SCOPUS:84900519286

SN - 1530-6984

VL - 14

SP - 2789

EP - 2793

JO - Nano Letters

JF - Nano Letters

IS - 5

ER -

Nanopillar spin filter tunnel junctions with manganite barriers

Abstract

Keywords

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