Superconducting spin switch with perpendicular magnetic anisotropy

Singh, Ajay; Sürgers, Christoph; Löhneysen, H. v.

doi:10.1103/physrevb.75.024513

Cited by 55 publications

(70 citation statements)

References 23 publications

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“…[12][13][14][15] The terms direct superconducting spin ͑DSS͒ and inverse superconducting spin ͑ISS͒ switch were introduced to describe enhanced or depressed superconductivity for AP alignment of the magnetizations of the ferromagnetic layers. 13 It has been accepted that an ISS governed by AP alignment ought to exhibit a well-defined positive plateau in the MR between the two coercive fields of top and bottom layers, 13,14,16 while a DSS governed by the exchange field effect would have a negative MR. 10 The domain state of the ferromagnet can also play a primary role in modulating the pairing amplitude by the ͑dipolar͒ stray fields generated by domains or domain walls 17 in a way which in F/S/F structures may also be determined by magnetic alignment. 10,16,18 Stray fields are expected to yield ISS in the sense of exhibiting positive MR, but instead of a plateau, MR peaks appear at the coercive fields where the domain state is formed.…”

Section: Introductionmentioning

confidence: 99%

Directionally controlled superconductivity in ferromagnet/superconductor/ferromagnet trilayers with biaxial easy axes

et al. 2010

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We report on the magnetic anisotropy controlled modulation of the superconductivity in La 0.7 Ca 0.3 MnO 3 / YBa 2 Cu 3 O 7−␦ / La 0.7 Ca 0.3 MnO 3 ferromagnet/superconductor/ferromagnet hybrids with biaxial easy axes. The magnetoresistance ͑MR͒ is determined by the local misalignment of the magnetizations in the two layers and exhibits a positive MR plateau for antiparallel alignment along the easy axes and negative MR peaks at the coercive field near the hard axes. This evidences the importance of spin-dependent interfacial scattering effects ͑as opposed to stray fields͒ in the MR behavior of superconducting oxide inverse spin switches.

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Section: Introductionmentioning

confidence: 99%

Directionally controlled superconductivity in ferromagnet/superconductor/ferromagnet trilayers with biaxial easy axes

et al. 2010

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“…These concepts have been experimentally realized in structures combining low-T c superconductors and transition-metal ferromagnets. [3][4][5] Recent reports [6][7][8] have shown an inverse superconducting spin-switch behavior in F/S/F structures with strong ferromagnets, where superconductivity is favored for parallel orientation of the adjacent magnetizations. Its origin is a subject of debate.…”

Section: Introductionmentioning

confidence: 99%

Origin of the inverse spin-switch behavior in manganite/cuprate/manganite trilayers

et al. 2008

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We studied ferromagnet/superconductor/ferromagnet trilayers based on La 0.7 Ca 0.3 MnO 3 manganite and YBa 2 Cu 3 O 7−␦ ͑YBCO͒ high-T c cuprate with magnetoresistance and magnetization measurements. We find an inverse superconducting spin-switch behavior, where superconductivity is favored for parallel alignment of the magnetization in the ferromagnetic layers. We argue that this inverse superconducting spin switch originates from the transmission of spin-polarized carriers into the superconductor. In this picture, the thickness dependence of the magnetoresistance yields the spin-diffusion length in YBCO as 13 nm. A comparison of bilayers and trilayers allows ruling out the effect of the stray fields of the domain structure of the ferromagnet as the source of the inverse superconducting spin switch.

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“…On the other hand, a number of reports show a resistance increase when going to the AP alignment, suggesting that superconductivity might be favored in the P state. [9][10][11] The term "inverse" superconducting spin switch ͑SSS͒ has been coined to describe this behavior. 10 Its origin has been a subject of intense debate in recent years.…”

Section: Introductionmentioning

confidence: 99%

“…Some reports point out the possibility of spin-dependent transport effects, particularly for strong ferromagnets. [9][10][11] A competing interpretation outlines the importance of stray fields, generated in the domain state of the ferromagnet, depressing superconductivity. 12,13 Spin-dependent effects are expected to show up as a difference between transport properties of AP and P configurations.…”

Section: Introductionmentioning

confidence: 99%

Exchange-bias-modulated inverse superconducting spin switch inCoO/Co/YBa2Cu3O7−δ
Nemes
¹
,
Visani
²
,
Sefrioui
³

et al. 2010
Phys. Rev. B
5
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0
0
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We examine the interplay between ferromagnetism and superconductivity in bilayer and trilayer heterostructures based on Co, YBa 2 Cu 3 O 7−␦ ͑YBCO͒, and La 0.7 Ca 0.3 MnO 3 ͑LCMO͒ thin films grown on SrTiO 3 substrates with typical thicknesses of 10-15 nm. We have measured magnetoresistance below the resistivesuperconducting onset of the YBCO. Naturally oxidized antiferromagnetic CoO top layer films give rise to pronounced exchange bias, modifying the coercive field of the Co by several hundred Oe. This allows separating effects at coercivity, such as stray fields, from those of parallel vs. antiparallel magnetic alignment between top and bottom ferromagnetic layers. In bilayers of Co/YBCO and of LCMO/YBCO, we observe a small magnetoresistance peak centered at the coercive field of the ferromagnetic layer of at most 20%, which we attribute to the effect of stray fields generated in the domain state of the ferromagnet. In the case of the CoO/ Co/ YBCO/ LCMO/ SrTiO 3 trilayer, aside from the peaks at coercivity, we observe a well-defined plateau of the magnetoresistance extending between the coercive fields of the LCMO and Co, with a width that is modified by the exchange-biased Co layer. Reactivity between Co and YBCO at the interface gives rise to a progressive deterioration in the superconducting transition temperature. Aged samples display magnetoresistance peaks at the coercive fields of the Co and LCMO characteristic of stray fields without the magnetoresistance plateau between them.

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Superconducting spin switch with perpendicular magnetic anisotropy

Cited by 55 publications

References 23 publications

Directionally controlled superconductivity in ferromagnet/superconductor/ferromagnet trilayers with biaxial easy axes

Directionally controlled superconductivity in ferromagnet/superconductor/ferromagnet trilayers with biaxial easy axes

Origin of the inverse spin-switch behavior in manganite/cuprate/manganite trilayers

Exchange-bias-modulated inverse superconducting spin switch inCoO/Co/YBa2Cu3O7−δ
Nemes
¹
,
Visani
²
,
Sefrioui
³

et al. 2010
Phys. Rev. B
5
0
0
0
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Superconducting spin switch with perpendicular magnetic anisotropy

Cited by 55 publications

References 23 publications

Directionally controlled superconductivity in ferromagnet/superconductor/ferromagnet trilayers with biaxial easy axes

Directionally controlled superconductivity in ferromagnet/superconductor/ferromagnet trilayers with biaxial easy axes

Origin of the inverse spin-switch behavior in manganite/cuprate/manganite trilayers

Exchange-bias-modulated inverse superconducting spin switch inCoO/Co/YBa2Cu3O7−δNemes1, Visani2, Sefrioui3 et al. 2010Phys. Rev. B5000View full textAdd to dashboardCite

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Exchange-bias-modulated inverse superconducting spin switch inCoO/Co/YBa2Cu3O7−δ
Nemes
¹
,
Visani
²
,
Sefrioui
³

et al. 2010
Phys. Rev. B
5
0
0
0
View full text Add to dashboard Cite