Transport and magnetic properties of strong ferromagnetic pi-junctions

J. W. A. Robinson; Samanta Piano; Gavin Burnell; Chris Bell; Mark G. Blamire; Chris Bell

doi:10.1109/TASC.2007.898720

Transport and magnetic properties of strong ferromagnetic pi-junctions

J. W. A. Robinson^*, Samanta Piano, Gavin Burnell, Chris Bell, Mark G. Blamire, Chris Bell

^*Corresponding author for this work

School of Physics

Research output: Contribution to journal › Article (Academic Journal) › peer-review

8 Citations (Scopus)

Abstract

We have investigated the characteristic voltage dependence with ferromagnetic thickness in Josephson junctions consisting of conventional superconducting Nb electrodes and strongly ferromagnetic barriers: Co, Ni20Fe80(Py) and Ni. Strong oscillations in characteristic voltage suggestive of successive 0-Pi crossovers were observed with the thickness variation of the ferromagnetic layers. Such oscillations show excellent fits to existing theoretical models. The exchange energies of the Co, Py and Ni barriers have been estimated from the periodicity of the oscillations and found to be 309 meV, 201 meV and 80 meV respectively, which is in agreement with previous experimental and theoretical results. We also discuss magnetic behavior of our heterostructures and, in the case of Ni, we have determined its Curie temperature to be similar or equal to 571 K.

Original language	English
Pages (from-to)	641-644
Number of pages	4
Journal	IEEE Transactions on Applied Superconductivity
Volume	17
Issue number	2
DOIs	https://doi.org/10.1109/TASC.2007.898720
Publication status	Published - Jun 2007
Event	Applied Superconductivity Conference 2006 - Seattle, United Kingdom Duration: 27 Aug 2006 → 1 Sept 2006

Keywords

SUPERCONDUCTING TRANSITION-TEMPERATURE
MULTILAYERS
FILMS
THICKNESS

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@article{59f2d40a891c4031aa579a7a5f13a8c6,

title = "Transport and magnetic properties of strong ferromagnetic pi-junctions",

abstract = "We have investigated the characteristic voltage dependence with ferromagnetic thickness in Josephson junctions consisting of conventional superconducting Nb electrodes and strongly ferromagnetic barriers: Co, Ni20Fe80(Py) and Ni. Strong oscillations in characteristic voltage suggestive of successive 0-Pi crossovers were observed with the thickness variation of the ferromagnetic layers. Such oscillations show excellent fits to existing theoretical models. The exchange energies of the Co, Py and Ni barriers have been estimated from the periodicity of the oscillations and found to be 309 meV, 201 meV and 80 meV respectively, which is in agreement with previous experimental and theoretical results. We also discuss magnetic behavior of our heterostructures and, in the case of Ni, we have determined its Curie temperature to be similar or equal to 571 K.",

keywords = "SUPERCONDUCTING TRANSITION-TEMPERATURE, MULTILAYERS, FILMS, THICKNESS",

author = "Robinson, {J. W. A.} and Samanta Piano and Gavin Burnell and Chris Bell and Blamire, {Mark G.} and Chris Bell",

year = "2007",

month = jun,

doi = "10.1109/TASC.2007.898720",

language = "English",

volume = "17",

pages = "641--644",

journal = "IEEE Transactions on Applied Superconductivity",

issn = "1051-8223",

publisher = "Institute of Electrical and Electronics Engineers (IEEE)",

number = "2",

note = "Applied Superconductivity Conference 2006 ; Conference date: 27-08-2006 Through 01-09-2006",

}

TY - JOUR

T1 - Transport and magnetic properties of strong ferromagnetic pi-junctions

AU - Robinson, J. W. A.

AU - Piano, Samanta

AU - Burnell, Gavin

AU - Bell, Chris

AU - Blamire, Mark G.

AU - Bell, Chris

PY - 2007/6

Y1 - 2007/6

N2 - We have investigated the characteristic voltage dependence with ferromagnetic thickness in Josephson junctions consisting of conventional superconducting Nb electrodes and strongly ferromagnetic barriers: Co, Ni20Fe80(Py) and Ni. Strong oscillations in characteristic voltage suggestive of successive 0-Pi crossovers were observed with the thickness variation of the ferromagnetic layers. Such oscillations show excellent fits to existing theoretical models. The exchange energies of the Co, Py and Ni barriers have been estimated from the periodicity of the oscillations and found to be 309 meV, 201 meV and 80 meV respectively, which is in agreement with previous experimental and theoretical results. We also discuss magnetic behavior of our heterostructures and, in the case of Ni, we have determined its Curie temperature to be similar or equal to 571 K.

AB - We have investigated the characteristic voltage dependence with ferromagnetic thickness in Josephson junctions consisting of conventional superconducting Nb electrodes and strongly ferromagnetic barriers: Co, Ni20Fe80(Py) and Ni. Strong oscillations in characteristic voltage suggestive of successive 0-Pi crossovers were observed with the thickness variation of the ferromagnetic layers. Such oscillations show excellent fits to existing theoretical models. The exchange energies of the Co, Py and Ni barriers have been estimated from the periodicity of the oscillations and found to be 309 meV, 201 meV and 80 meV respectively, which is in agreement with previous experimental and theoretical results. We also discuss magnetic behavior of our heterostructures and, in the case of Ni, we have determined its Curie temperature to be similar or equal to 571 K.

KW - SUPERCONDUCTING TRANSITION-TEMPERATURE

KW - MULTILAYERS

KW - FILMS

KW - THICKNESS

U2 - 10.1109/TASC.2007.898720

DO - 10.1109/TASC.2007.898720

M3 - Article (Academic Journal)

SN - 1051-8223

VL - 17

SP - 641

EP - 644

JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

IS - 2

T2 - Applied Superconductivity Conference 2006

Y2 - 27 August 2006 through 1 September 2006

ER -

Transport and magnetic properties of strong ferromagnetic pi-junctions

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Keywords

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