Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 175-179 |
| Journal | Journal of magnetism and magnetic materials |
| Volume | 383 |
| DOIs | |
| Publication status | Published - 1 Nov 2015 |
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Keywords
- METIS-307828
- IR-93523
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Detection of small exchange fields in S/F structures. / Vasenko, A.S.; Kawabata, S.; Ozaeta, A.; Golubov, Alexandre Avraamovitch; Stolyarov, V.S.; Bergeret, F.S.; Hekking, F.W.J.
In: Journal of magnetism and magnetic materials, Vol. 383, 01.11.2015, p. 175-179.Research output: Contribution to journal › Article › Academic › peer-review
TY - JOUR
T1 - Detection of small exchange fields in S/F structures
AU - Vasenko, A.S.
AU - Kawabata, S.
AU - Ozaeta, A.
AU - Golubov, Alexandre Avraamovitch
AU - Stolyarov, V.S.
AU - Bergeret, F.S.
AU - Hekking, F.W.J.
N1 - Selected papers from the sixth Moscow International Symposium on Magnetism (MISM-2014)
PY - 2015/11/1
Y1 - 2015/11/1
N2 - Ferromagnetic materials with exchange fields EexEex smaller or of the order of the superconducting gap ΔΔ are important for applications of corresponding (s-wave) superconductor/ferromagnet/superconductor (SFS) junctions. Presently such materials are not known but there are several proposals how to create them. Small exchange fields are in principle difficult to detect. Based on our results we propose reliable detection methods of such small EexEex. For exchange fields smaller than the superconducting gap the subgap differential conductance of the normal metal–ferromagnet–insulator–superconductor (NFIS) junction shows a peak at the voltage bias equal to the exchange field of the ferromagnetic layer, eV=EexeV=Eex. Thus measuring the subgap conductance one can reliably determine small Eex<ΔEex<Δ. In the opposite case Eex>ΔEex>Δ one can determine the exchange field in scanning tunneling microscopy (STM) experiment. The density of states of the FS bilayer measured at the outer border of the ferromagnet shows a peak at the energy equal to the exchange field, E=EexE=Eex. This peak can be only visible for small enough exchange fields of the order of few ΔΔ.
AB - Ferromagnetic materials with exchange fields EexEex smaller or of the order of the superconducting gap ΔΔ are important for applications of corresponding (s-wave) superconductor/ferromagnet/superconductor (SFS) junctions. Presently such materials are not known but there are several proposals how to create them. Small exchange fields are in principle difficult to detect. Based on our results we propose reliable detection methods of such small EexEex. For exchange fields smaller than the superconducting gap the subgap differential conductance of the normal metal–ferromagnet–insulator–superconductor (NFIS) junction shows a peak at the voltage bias equal to the exchange field of the ferromagnetic layer, eV=EexeV=Eex. Thus measuring the subgap conductance one can reliably determine small Eex<ΔEex<Δ. In the opposite case Eex>ΔEex>Δ one can determine the exchange field in scanning tunneling microscopy (STM) experiment. The density of states of the FS bilayer measured at the outer border of the ferromagnet shows a peak at the energy equal to the exchange field, E=EexE=Eex. This peak can be only visible for small enough exchange fields of the order of few ΔΔ.
KW - METIS-307828
KW - IR-93523
U2 - 10.1016/j.jmmm.2014.11.009
DO - 10.1016/j.jmmm.2014.11.009
M3 - Article
VL - 383
SP - 175
EP - 179
JO - Journal of magnetism and magnetic materials
JF - Journal of magnetism and magnetic materials
SN - 0304-8853
ER -