Magneto-transport and magnetic studies of epitaxial
manganite/cuprate/manganite trilayers
Minaxi Sharma1*, Kuldeep Kumar Sharma 1, Sumit Bhardwaj3, Ravi Kumar 2, 4, Ram Janay
Choudhary3
1
2
Department of Physics, National Institute of Technology, Hamirpur -177005, India
Centre for Material Science and Engineering, National Institute of Technology, Hamirpur -177005, India
3
UGC-DAE-Consortium for Scientific Research, Khandwa Road, Indore - 452001, India.
4
Beant College of Engineering and Technology, Gurdaspur Punjab -143521, India.
*
Corresponding author’s e-mail:meenanith@gmail.com, Tel.: +91-9817491056; Fax: +91-1972-223834
Abstract: We report here the thickness dependent magneto-transport and magnetic study of YBCO superconductor in
epitaxial LSMO/YBCO/LSMO heterostructures, fabricated on SrTiO3 substrate using pulsed laser deposition. Magnetotransport and magnetic properties are found to be dependent on the thicknesses of YBCO spacer layer. We also deduce that
for fixed thicknesses of top and bottom LSMO layers, superconductivity is completely suppressed. Magnetic studies reveal
that at room temperature LSMO layers interact antiferromagnetically through YBCO spacer layer.
Keywords: Cuprate, ,manganite, trilayers, ferromagnetism, superconductivity.
Introduction
The study of superconductivity in
ferromagnetic (FM) and superconducting (SC)
multilayer systems is attracted much attention due to
several applications in spintronic deveces [1]. The
study of these multilayers has concentrate on the
variation of superconducting critical temperature as a
function of thickness of the ferromagnetic layers. It is
worth mentioning here that the magnetic moments and
magnetic order are remarkably effective in destruction
of cooper pairs and consequently strongly depressing
the superconductivity. The aim of present study is to
obtain the information about the interaction between
top and bottom LSMO layers through spacer YBCO
layer with different thicknesses.
which indicates that at higher temperature the top and
bottom LSMO layers through YBCO spacer layer
interact antiferromagnetically.
Fig. 1. ϕ-scans (a) SrTiO3 substare (b) LSMO(200
nm)/YBCO(50 nm)/LSMO (200 nm) trilayers.
Experimental Detail
Epitaxial trilayers of LSMO/YBCO/LSMO were
grown at 820˚ C temperature on (001) SrTiO3
substrates using pulsed laser deposition (PLD) [2].
Results and Discussion
Figure 1 displays the phi-scan along (012) plane of
SrTiO3 substrate (see Fig 1(a)) and LSMO(200
nm)/YBCO (50 nm)/LSMO (200 nm) trilayers along
(110) (see Fig 1(b)) and found that the grown trilayers
are epitaxial in nature. Magneto-transport properties
of LSMO/YBCO/LSMO trilayers are dependent on
the thicknesses of YBCO spacer layer. Figure 2
illustrates the hysteresis loops of trilayers at 100 K
and 300 K temperature. At 100 K and 300 K, the M-H
loops indicate the ferromagnetic nature of the trilayers
(see Fig. 2(a)) and somewhat butterfly type feature
(see Fig. 2(b)), respectively. This reveals that at room
temperature there is coexistence of antiferromagnetic
and ferromagnetic interaction in the present system
Fig.2. Hysteresis loops of LSMO(200 nm)/YBCO(50
nm/LSMO (200 nm) trilayers at (a) 100 K, (b) 300 K.
References
[1] S. A. Wolf, D. D. Awschalom, R. A. Buhrman, J.
M. Daughton, S. von Molnar, M. L. Roukes, A. Y.
Chtchelkanova, and D. M. Treger, “Spintronics: a
spin-based electronics vision for the future”, Science,
294, (2001), 1488-1495.
[2] M. Sharma, K. K. Sharma, Ravi Kumar and R. J.
Choudhary, “Electrical and magneto- transport
properties of ferromagnet/superconductor/ferromagnet
based heterostructure” Physica C, 497, (2014) 30-33.