Magnetic and magnetotransport properties of La0.7Sr0.3MnO3/Permalloy heterostructures

Ruotolo, A.; Oropallo, A.; Granozio, F. Miletto; Pepe, G. P.; Perna, Paolo; Uccio, U. Scotti di

doi:10.1063/1.2216891

Cited by 21 publications

(21 citation statements)

References 13 publications

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“…For instance, the anisotropic in-plane strain, i.e., e 001 ½ 6 ¼ e 1 10 ½ , imposed by the STO(110) substrate gives rise to the large uniaxial magnetic anisotropy found in the LSMO(110) film. 4 In turn, the existence of well oriented steps at the vicinal STO(100) substrate breaks the symmetry of the LSMO(100) film, in principle isotropic in-plane strained, resulting in step-induced uniaxial magnetic anisotropy. 24 On the other hand, larger anisotropy fields are expected for the films with larger surface roughness, as found for the LSMO film grown on the nominally flat STO(110) substrates.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Tailoring magnetic anisotropy in epitaxial half metallic La0.7Sr0.3MnO3 thin films

Perna

Rodrigo

Jiménez

et al. 2011

Journal of Applied Physics

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We present a detailed study on the magnetic properties, including anisotropy, reversal fields, and magnetization reversal processes, of well characterized half-metallic epitaxial La 0.7 Sr 0.3 MnO 3 (LSMO) thin films grown onto SrTiO 3 (STO) substrates with three different surface orientations, i.e., (001), (110), and (118). The latter shows step edges oriented parallel to the [110] (in-plane) crystallographic direction. Room temperature high resolution vectorial Kerr magnetometry measurements have been performed at different applied magnetic field directions in the whole angular range. In general, the magnetic properties of the LSMO films can be interpreted with just the uniaxial term, with the anisotropy axis given by the film morphology, whereas the strength of this anisotropy depends on both structure and film thickness. In particular, LSMO films grown on nominally flat (110)-oriented STO substrates presents a well defined uniaxial anisotropy originated from the existence of elongated in-plane [001]-oriented structures, whereas LSMO films grown on nominally flat (001)-oriented STO substrates show a weak uniaxial magnetic anisotropy, with the easy axis direction aligned parallel to residual substrate step edges. Elongated structures are also found for LSMO films grown on vicinal STO(001) substrates. These films present a well-defined uniaxial magnetic anisotropy, with the easy axis lying along the step edges, and its strength increases with the LSMO thickness. It is remarkable that this step-induced uniaxial anisotropy has been found for LSMO films up to 120 nm thickness. Our results are promising for engineering novel half-metallic magnetic devices that exploit tailored magnetic anisotropy.

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Section: Magnetic Propertiesmentioning

confidence: 99%

Tailoring magnetic anisotropy in epitaxial half metallic La0.7Sr0.3MnO3 thin films

Perna

Rodrigo

Jiménez

et al. 2011

Journal of Applied Physics

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“…3 The biaxial and uniaxial anisotropies originate from the crystal symmetry and substrate-induced anisotropy, respectively. By resorting to the fabrication of artificial heterostructures, 5 thin films, [6][7][8] and superlattices, 9 we can exploit the symmetry breaking in order to control and tailor the magnetic properties of the materials, and, therefore, alter both magnetization easy and hard axes, and reversal processes. 10 Half metallic La 0:7 Sr 0:3 MnO 3 (LSMO) manganite, showing both a Curie temperature above 300 K and an almost 100% spin polarization, is of particular interest for the engineering of spintronics devices operating at room temperature (RT) such as read-heads magnetic hard disks and nonvolatile magnetic memories.…”

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confidence: 99%

Magnetization reversal in half metallic La_0.7Sr_0.3MnO₃ films grown onto vicinal surfaces

Perna

Rodrigo

Jiménez

et al. 2011

Journal of Applied Physics

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We present the study of the magnetic properties of well-characterized epitaxial half metallic La 0:7 Sr 0:3 MnO 3 films grown onto vicinal SrTiO 3 (001) substrates with different miscut angles. Room temperature high resolution vectorial Kerr magnetometry measurements have been performed at different applied magnetic field directions in the whole angular range. The films present a substrate-induced uniaxial (twofold) magnetic anisotropy originated from in-plane [110]-oriented elongated structures, whereas the strength of this anisotropy increases with the miscut angle of the substrate surfaces. Our results demonstrate that we can artificially control the magnetic anisotropy of epitaxial films, up to 120 nm thick, by exploiting the substrate-induced anisotropy. We also determine in this case the minimum vicinal angle required to get well-defined uniaxial magnetic anisotropy. In cubic crystal symmetry epitaxial magnetic thin films the competition between the biaxial (fourfold) and the additional uniaxial (twofold) anisotropies can result in a magnetic reorientation, which depends on many parameters, such as substrate step density, 1,2 thickness, 3 angle of deposition, 4 and even the temperature range. 3 The biaxial and uniaxial anisotropies originate from the crystal symmetry and substrate-induced anisotropy, respectively. By resorting to the fabrication of artificial heterostructures, 5 thin films, 6-8 and superlattices, 9 we can exploit the symmetry breaking in order to control and tailor the magnetic properties of the materials, and, therefore, alter both magnetization easy and hard axes, and reversal processes. 10 Half metallic La 0:7 Sr 0:3 MnO 3 (LSMO) manganite, showing both a Curie temperature above 300 K and an almost 100% spin polarization, is of particular interest for the engineering of spintronics devices operating at room temperature (RT) such as read-heads magnetic hard disks and nonvolatile magnetic memories. 11 In this system, the substrate induces tensile or compressive strain to the film depending on the film-substrate lattice mismatch, determining in-plane or out-of-plane easy magnetization directions, respectively. 12 In particular, in LSMO/SrTiO 3 (STO)(001) an in-plane biaxial magnetic anisotropy ascribed to the substrate-induced in-plane tensile strain is generally observed. 12,13 Moreover, by using vicinal surfaces we can fabricate artificially periodic stepped surfaces with in-plane magnetic anisotropy. 14 In vicinal substrates, the surfaces are intentionally misoriented to a (near) low index surface, therefore determining surface step edges. In such a way, the high symmetry of the low index surface is broken and an additional uniaxial anisotropy is expected. 15 In-plane uniaxial magnetic anisotropy at RT already has been reported in 25-and 7-nm-thick LSMO films deposited on very low miscut STO substrates (0.13 and 0.24 ). 3 More recently, some of the authors reported on a well-defined uniaxial magnetic anisotropy in LSMO film, up to 70 nm thick, deposited on 10 vicinal STO(001) substrate....

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“…We chose to use (1 1 0)-oriented substrates in order to achieve a stressinduced in-plane anisotropy that makes the hysteresis loop sharper when the external field is applied along the [0 0 1] easy axis. Detailed fabrication process and structural and magnetic characterizations have been presented elsewhere [4,5].…”

Section: Methodsmentioning

confidence: 99%

Novel low-field magnetoresistive devices based on manganites

Ruotolo

Granozio

Oropallo

et al. 2007

Journal of Magnetism and Magnetic Materials

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We present novel low-field magnetoresistive devices based on the ferromagnetic manganite La 0.7 Sr 0.3 MnO 3 operating in the current in plane (CIP) configuration. In these planar spin-valve devices, a focused Ga + beam is used to create pinning centers for magnetic domain walls. The spin-dependent scattering of polarized electrons at the domain walls (DW) is responsible for the magnetoresistance observed in the patterned tracks. The magneto-transport properties of these devices are interpreted within a model for DW magnetoresistance. Applications such as magnetic data storage can be envisaged for the structures we investigated. r

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Magnetic and magnetotransport properties of La0.7Sr0.3MnO3/Permalloy heterostructures

Abstract: Articles you may be interested inEffect of superconducting spacer layer thickness on magneto-transport and magnetic properties of La0.7Sr0.3MnO3/YBa2Cu3O7/La0.7Sr0.3MnO3 heterostructures

Cited by 21 publications

References 13 publications

Tailoring magnetic anisotropy in epitaxial half metallic La0.7Sr0.3MnO3 thin films

Tailoring magnetic anisotropy in epitaxial half metallic La0.7Sr0.3MnO3 thin films

Magnetization reversal in half metallic La_0.7Sr_0.3MnO₃ films grown onto vicinal surfaces

Novel low-field magnetoresistive devices based on manganites

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Magnetic and magnetotransport properties of La0.7Sr0.3MnO3/Permalloy heterostructures

Abstract: Articles you may be interested inEffect of superconducting spacer layer thickness on magneto-transport and magnetic properties of La0.7Sr0.3MnO3/YBa2Cu3O7/La0.7Sr0.3MnO3 heterostructures

Cited by 21 publications

References 13 publications

Tailoring magnetic anisotropy in epitaxial half metallic La0.7Sr0.3MnO3 thin films

Tailoring magnetic anisotropy in epitaxial half metallic La0.7Sr0.3MnO3 thin films

Magnetization reversal in half metallic La0.7Sr0.3MnO3 films grown onto vicinal surfaces

Novel low-field magnetoresistive devices based on manganites

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Magnetization reversal in half metallic La_0.7Sr_0.3MnO₃ films grown onto vicinal surfaces