Thickness Dependent Properties of Sr2FeMoO6 Thin Films Grown on SrTiO3 and (LaAlO3)0.3(Sr2AlTaO6)0.7 Substrates

Angervo, Ilari; Saloaro, M.; Palonen, Heikki; Majumdar, Sayani; Paturi, P.

doi:10.1016/j.phpro.2015.12.170

Cited by 8 publications

(7 citation statements)

References 30 publications

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“…[84] With increasing temperature, the coercive field decreases. [85] Table 3 lists the coefficients of Equation ( 34) for SFMO powders and ceramics. Figure 6 compares the calculated values for m(T ) and m(B) with experimental data.…”

Section: Intergrain Mr Due To Spin-dependent Tunnelingmentioning

confidence: 99%

Resistivity and Tunnel Magnetoresistance in Double‐Perovskite Strontium Ferromolybdate Ceramics

Suchaneck

Artiukh²,

Gerlach

2022

Physica Status Solidi (b)

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The low‐field magnetoresistance properties in double‐perovskite strontium ferromolybdate core–shell structures arise from spin‐dependent tunneling through a barrier formed by the shell. It is strongly dependent on synthesis conditions. In this work, first, the resistivity behavior of granular strontium ferromolybdate ceramics comprising intergrain tunnel barriers is reviewed. Based on this generalization, the modification of the tunneling process with barrier thickness and interface conditions is demonstrated. For the first time, equations for the magnetoresistance in each special case are derived.

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Section: Intergrain Mr Due To Spin-dependent Tunnelingmentioning

confidence: 99%

Resistivity and Tunnel Magnetoresistance in Double‐Perovskite Strontium Ferromolybdate Ceramics

Suchaneck

Artiukh²,

Gerlach

2022

Physica Status Solidi (b)

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“…In the present half-metallic CFMO system, two spin channels act parallel to each other [19,20]. Here, the spin-up channel with a band-gap at the Fermi level is semiconducting; while the spin-down channel without any gap has a metallic nature.…”

Section: Electrical Propertiesmentioning

confidence: 88%

X-ray absorption near-edge, terahertz and Raman spectroscopies evidence growth-orientation dependent cation order, phase transitions and spin–phonon coupling in half-metallic Ca₂FeMoO₆ thin films

Yadav,

Prajapati,

Rajput

et al. 2023

New J. Phys.

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The disorder due to anti-site cation distribution is intrinsic to the double perovskites wherein the crystal orientations of the substrate template are predicted to offer different degrees of cation order in thin film form. To demonstrate this effect, epitaxial thin films of half-metallic double perovskite Ca2FeMoO6 (CFMO) were prepared on (100) and (111) oriented LaAlO3 substrates in vacuum and nitrogen atmospheres. The findings using X-ray absorption near-edge structure, Terahertz (THz) and Raman spectroscopies, in combination with magnetization show that (111) epitaxial template effectively restricts the Fe–Mo anti-site cation disorder. A resultantly enhanced cation order in (111) films induces dramatic transformations in its properties as follows: (i) significantly enhanced ferromagnetic exchange interactions and saturation magnetization, (ii) a significant increase in the Curie temperatures, (iii) a metallic behavior down to much lower temperature (∼75 K) compared to that down to 200 K for (100) film, (iv) an enhanced spin–phonon coupling. The complex THz optical conductivity spectra evaluated in the framework of Drude and Drude–Smith phenomenological models and the temperature-dependent Raman data fitted to the Balkanski model corroborate well to indicate an enhanced cation order in (111) films. While this study establishes a dominant role of crystallographic orientation in the much-desired control of cation order in double perovskites, a demonstration of the same in room temperature half-metallic CFMO system could reinforce its technological utility both as active and passive components in emergent spintronic functionalities.

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“…Unfortunately, most of the reports on SFMO thin film deposition are devoted to films with a thickness of about 100 nm [22]. To the best of our knowledge, there is only one report considering the thickness dependence of the saturation magnetization M s of SFMO thin films deposited by PLD onto STO (001) and (LaAlO 3 ) 0.3 (Sr 2 AlTaO 6 ) 0.7 (001) (LSAT) substrates [76]. Applying Equation (11) to this data, we find a total DL thickness (we are not able to distinguish between interface and surface layer) of 11 to 14 nm (Figure 4).…”

Section: Estimation Of the Dead Layer Thickness Of Sfmo Thin Filmsmentioning

confidence: 99%

Strontium Ferromolybdate-Based Magnetic Tunnel Junctions

et al. 2022

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Thin-film strontium ferromolybdate is a promising material for applications in room-temperature magnetic tunnel junction devices. These are spin-based, low-power-consuming alternatives to CMOS in non-volatile memories, comparators, analog-to-digital converters, and magnetic sensors. In this work, we consider the main tasks to be solved when creating such devices based on strontium ferromolybdate: (i) selecting an appropriate tunnel barrier material, (ii) determining the role of the interface roughness and its quantification, (iii) determining the influence of the interface dead layer, (iv) establishing appropriate models of the tunnel magnetoresistance, and (v) promoting the low-field magnetoresistance in (111)-oriented thin films. We demonstrate that (i) barrier materials with a lower effective electronegativity than strontium ferromolybdate are beneficial, (ii) diminution of the magnetic offset field (the latter caused by magnetic coupling) requires a wavy surface rather than solely a surface with small roughness, (iii) the interface dead-layer thickness is of the order of 10 nm, (iv) the tunnel magnetoresistance deteriorates due to spin-independent tunneling and magnetically disordered interface layers, and (v) antiphase boundaries along the growth direction promote the negative low-field magnetoresistance by reducing charge carrier scattering in the absence of the field.

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Thickness Dependent Properties of Sr2FeMoO6 Thin Films Grown on SrTiO3 and (LaAlO3)0.3(Sr2AlTaO6)0.7 Substrates

Cited by 8 publications

References 30 publications

Resistivity and Tunnel Magnetoresistance in Double‐Perovskite Strontium Ferromolybdate Ceramics

Resistivity and Tunnel Magnetoresistance in Double‐Perovskite Strontium Ferromolybdate Ceramics

X-ray absorption near-edge, terahertz and Raman spectroscopies evidence growth-orientation dependent cation order, phase transitions and spin–phonon coupling in half-metallic Ca₂FeMoO₆ thin films

Strontium Ferromolybdate-Based Magnetic Tunnel Junctions

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Thickness Dependent Properties of Sr2FeMoO6 Thin Films Grown on SrTiO3 and (LaAlO3)0.3(Sr2AlTaO6)0.7 Substrates

Cited by 8 publications

References 30 publications

Resistivity and Tunnel Magnetoresistance in Double‐Perovskite Strontium Ferromolybdate Ceramics

Resistivity and Tunnel Magnetoresistance in Double‐Perovskite Strontium Ferromolybdate Ceramics

X-ray absorption near-edge, terahertz and Raman spectroscopies evidence growth-orientation dependent cation order, phase transitions and spin–phonon coupling in half-metallic Ca2FeMoO6 thin films

Strontium Ferromolybdate-Based Magnetic Tunnel Junctions

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Product

Resources

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X-ray absorption near-edge, terahertz and Raman spectroscopies evidence growth-orientation dependent cation order, phase transitions and spin–phonon coupling in half-metallic Ca₂FeMoO₆ thin films