Anisotropic properties of oblique angle deposited permalloy thin films

Ali, Zeeshan; Basaula, Dharma R.; Eid, Khalid; Khan, Mahmud

doi:10.1016/j.tsf.2021.138899

Cited by 12 publications

(6 citation statements)

References 59 publications

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“…3a, the thicker pristine CRO 40 film exhibits bulk-like metallic transport (dρ/dT > 0) down to ~21 K, followed by a small resistivity upturn (see Supplementary Fig. 9 for details), characterized by weak localization [41][42][43][44][45] . The intermediate thickness CRO 20 film features a metallic behavior at high temperatures, but exhibits a resistivity upturn below ~95 K. Such a robust resistivity upturn at low temperatures is frequently observed in many metallic oxide films, especially close to the verge of a metal-insulator transition [41][42][43][44] .…”

Section: Electron Transport Of Pristine and δ-Doped Caruo 3 Filmsmentioning

confidence: 99%

Emergent ferromagnetism and insulator-metal transition in δ-doped ultrathin ruthenates

et al. 2022

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Heterostructures of complex transition metal oxides are known to induce extraordinary emergent quantum states that arise from broken symmetry and other discontinuities at interfaces. Here we report the emergence of unusual, thickness-dependent properties in ultrathin CaRuO3 films by insertion of a single isovalent SrO layer (referred to as δ-doping). While bulk CaRuO3 is metallic and nonmagnetic, films thinner than or equal to ~15-unit cells (u.c.) are insulating though still nonmagnetic. However, δ-doping to middle of such CaRuO3 films induces an insulator-to-metal transition and unusual ferromagnetism with strong magnetoresistive behavior. Atomically resolved imaging and density-functional-theory calculations reveal that the whole δ-doped film preserves the bulk-CaRuO3 orthorhombic structure, while appreciable structural and electronic changes are highly localized near the SrO layer. The results highlight delicate nature of magnetic instability in CaRuO3 and subtle effects that can alter it, especially the role of A-site cation in electronic and magnetic structure additional to lattice distortion in ruthenates. It also provides a practical approach to engineer material systems via highly localized modifications in their structure and composition that may offer new routes to the design of oxide electronics.

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Section: Electron Transport Of Pristine and δ-Doped Caruo 3 Filmsmentioning

confidence: 99%

Emergent ferromagnetism and insulator-metal transition in δ-doped ultrathin ruthenates

et al. 2022

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“…As a result, the growth direction of the inclined columnar crystals deviates from being perpendicular to the substrate, leading to an easy plane that is offset from the substrate at a certain angle. The direction along which the particles are deposited in the thin-films plane is known as the hard axis, while the direction perpendicular to the deposition direction is referred to as the easy axis [ 23 , 24 ].…”

Section: Resultsmentioning

confidence: 99%

High-Index Epitaxial Fe Films Grown on MgO(113)

Peng

Chen

et al. 2023

Materials

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The epitaxial growth of high-index Fe films on MgO(113) substrates is successfully achieved using direct current (DC) magnetron sputtering, despite the significant lattice constant mismatch between Fe and MgO. X-ray diffraction (XRD) analysis is employed to characterize the crystal structure of Fe films, revealing an Fe(103) out-of-plane orientation. Furthermore, our investigation reveals that the Fe[010] direction is parallel to the MgO[11¯0] direction within the films plane. These findings provide valuable insights into the growth of high-index epitaxial films on substrates with large lattice constant mismatch, thereby contributing to the advancement of research in this field.

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“…However, we postulate that an induced anisotropy can give rise to an IP magnetization reversal triggered by OOP magnetic field if the direction of the uniaxial anisotropic vector slightly deviates from the normal direction to the film. Such a slight deviation from the perfectly OOP case is possible notably because of misalignment between the sputtering source and the sample [28][29][30][31] or due to the presence of stray field in the vicinity of the sputter head. [32] In addition, surface magnetic anisotropy and/or additional magnetostriction anisotropy may be induced at the interface between the Py film and substrate or a cap layer.…”

Section: Modelling Of the Anisotropic Magnetoresistancementioning

confidence: 99%

Tunable Perpendicular Magnetoresistive Sensor Driven by Shape and Substrate Induced Magnetic Anisotropy

Barrera

Fourneau

Martín

et al. 2022

Advanced Sensor Research

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Control of magnetization reversal processes is a key issue for the implementation of magnetic materials in technological applications. The modulation of shape magnetic anisotropy in nanowire structures with a high aspect ratio is an efficient way to tune sharp in-plane magnetic switching. However, control of fast magnetization reversal processes induced by perpendicular magnetic fields is much more challenging. Here, tunable sharp magnetoresistance changes, triggered by out-of-plane magnetic fields, are demonstrated in thin permalloy strips grown on LaAlO 3 single crystal substrates. Micromagnetic simulations are used to evaluate the resistance changes of the strips at different applied field values and directions and correlate them with the magnetic domain distribution. The experimentally observed sharp magnetic switching, tailored by the shape anisotropy of the strips, is properly accounted for by numerical simulations when considering a substrate-induced uniaxial magnetic anisotropy. These results are promising for the design of magnetic sensors and other advanced magnetoresistive devices working with perpendicular magnetic fields by using simple structures.

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Anisotropic properties of oblique angle deposited permalloy thin films

Cited by 12 publications

References 59 publications

Emergent ferromagnetism and insulator-metal transition in δ-doped ultrathin ruthenates

Emergent ferromagnetism and insulator-metal transition in δ-doped ultrathin ruthenates

High-Index Epitaxial Fe Films Grown on MgO(113)

Tunable Perpendicular Magnetoresistive Sensor Driven by Shape and Substrate Induced Magnetic Anisotropy

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