Microstructural and magnetic characterization of Fe- and Ir-based multilayers

Arias-Egido, E.; Laguna-Marco, M. A.; Sánchez-Marcos, J.; Piquer, Cristina; Chaboy, J.; Àvila, Marta; López, J. Garcı́a

doi:10.1103/physrevmaterials.2.014402

Cited by 3 publications

(5 citation statements)

References 57 publications

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“…Soon after the discovery of GMR, the number of reports summarizing other properties increased exponentially. Since then, compositionally modulated systems have been the focus of research in the areas of mechanical [8,[53][54][55][56][57][58][59][60][61][62][63][64][65][66][67], optical [68][69][70][71][72][73][74][75][76][77][78][79][80], electrical [81] and magnetic [2,3,25,29,48,82,83] properties, as well as for tolerance to radiation damage [84][85][86][87][88][89][90][91], thermal conductivity [92] and thermal stability [34,35,…”

Section: Nmmsmentioning

confidence: 99%

“…The successful application of metallic thin films is in great part due to the fact that they can tolerate structural and chemical imperfections while still exhibiting interesting physical properties [23]. While many thin films and coatings are homogeneous in composition (homophase), some of them are prepared by alternating nanoscale layers of two (or more) different single-phase metals (heterophase) [11,23,[26][27][28][29][30][31]. The periodic stacking of different metallic layers with individual layer thicknesses below 100 nm is commonly referred to as nanoscale metallic multilayers (NMMs), but they are often also called nanolaminates, nanolamellars, layered composites or condensates [3,11,23,[31][32][33][34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

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Nanomaterials by design: a review of nanoscale metallic multilayers

Sáenz-Trevizo

Hodge

2020

Nanotechnology

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Nanoscale metallic multilayers have been shown to have a wide range of outstanding properties, which differ to a great extent from those observed in monolithic films. Their exceptional properties are mainly associated with the large number of interfaces and the nanoscale layer thicknesses. Many studies have investigated these materials focusing on magnetic, mechanical, optical, or radiation tolerance properties. Thus, this review provides a summary of the findings in each area, including a description of the general attributes, the adopted synthesis methods and most common characterization techniques used. This information is followed by a compendium of the material properties and a brief discussion of related experimental data, as well as existing and promising applications. Other phenomena of interest, including thermal stability studies, self-propagating reactions and the progression from nano multilayers to amorphous and/or crystalline alloys, are also covered. In general, this review highlights the use of nano multilayer architectures as viable routes to overcome the challenges of designing and implementing new engineering materials at the nanoscale.

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Section: Nmmsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nanomaterials by design: a review of nanoscale metallic multilayers

Sáenz-Trevizo

Hodge

2020

Nanotechnology

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“…In Fe/Ir multilayers, as predicted by theory, a parallel alignment of induced magnetic moment in Ir layers with respect to Fe layer magnetization was observed. [ 24 ]…”

Section: Figurementioning

confidence: 99%

“…In Fe/Ir multilayers, as predicted by theory, a parallel alignment of induced magnetic moment in Ir layers with respect to Fe layer magnetization was observed. [24] We present the structural and magnetic study of interfacial region between Hf and Fe layers using the techniques of magneto-optical Kerr effect (MOKE) and soft X-ray absorption spectroscopy (SXAS). Highly sensitive nature of the two techniques allows us to characterize the interfacial region with submonolayer accuracy.…”

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confidence: 99%

Study of Interfaces in Hf/Fe System Using Magneto‐Optical Kerr Effect and Soft X‐Ray Absorption Spectroscopy

Vishwakarma

Gupta

Reddy

et al. 2020

Physica Rapid Research Ltrs

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Interface between layers of Fe and Hf is studied using magneto‐optical Kerr effect (MOKE) and soft X‐ray absorption spectroscopy (SXAS). Measurements as a function of the Fe layer thickness are done in a single sample by making use of a wedge‐shaped geometry for Fe layer sandwiched between two layers of Hf. SXAS measurements at the L‐edge of Fe provide evidence for interfacial alloying between Fe and Hf layers, with the thicknesses of the intermixed layers at Fe‐on‐Hf and Hf‐on‐Fe interfaces being 0.18 ± 0.05 and 0.27 ± 0.05 nm, respectively. Evolution of the MOKE hysteresis loop with Fe layer thickness gives an effective magnetic dead layer of 0.8 ± 0.1 nm at the two Fe/Hf interfaces together. Precise determination of the thickness of the intermixed layer and the magnetic dead layer using two independent techniques allows us to have a better insight into the interfacial magnetism and origin of magnetic dead layer at Fe/Hf interfaces. Present results suggest that the origin of the effective magnetic dead layer is partly due to modified magnetic moments of Fe and Hf in the intermixed regions and partly due to proximity‐induced magnetic moment in the interfacial Hf layers with its magnetic moment aligned antiparallel to the Fe layer.

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“…Moreover, the use of Ir (with a high Z) is connected to a high spin orbit interaction and hence these materials are promising for permanent magnets (high anisotropy). 40 Finally, the reported approach could open a new window of opportunity to design and prepare highly stable Ni/Ir-based MNPs that possess potential applications as a new type of catalyst due to a synergic effect between the two metals. 41…”

Section: Introductionmentioning

confidence: 99%

Tuning the structure and magnetic behavior of Ni–Ir-based nanoparticles in ionic liquids

Silva

Bernardi

Abarca

et al. 2018

Phys. Chem. Chem. Phys.

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We report on a simple preparation of extremely small diameter (ca. 2 nm) Ni-Ir-based NPs using Ni(COD)2 and [Ir(COD)OCH3]2 in 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (BMIm·NTf2). The prepared NPs had either core-shell-like or alloy-like structures with the presence of Ni,Ir-oxides, depending on the synthetic approach. X-ray diffraction (XRD), Rutherford backscattering spectrometry (RBS), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), extended X-ray absorption fine structure (EXAFS), and magnetic measurements are combined to describe the influence of nanostructure on the magnetic behavior of these nanosystems. The present findings reveal that the alloy NPs display a disordered magnetic state, similar to a spin glass (SG)-like system (Tf = 7.2 K). Core-shell NPs are formed by a magnetically blocked/unblocked core with a magnetically disordered shell as deduced from the two magnetic responses peaking at TB = 75 K and Tf = 5.8 K. Coupling at the core-shell interface leads to an exchange bias revealed at low temperature as horizontal shifts in the hysteresis loops of 0.12 kOe at 2 K.

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Microstructural and magnetic characterization of Fe- and Ir-based multilayers

Cited by 3 publications

References 57 publications

Nanomaterials by design: a review of nanoscale metallic multilayers

Nanomaterials by design: a review of nanoscale metallic multilayers

Study of Interfaces in Hf/Fe System Using Magneto‐Optical Kerr Effect and Soft X‐Ray Absorption Spectroscopy

Tuning the structure and magnetic behavior of Ni–Ir-based nanoparticles in ionic liquids

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