Magnetic moment configuration: One of decisive factors to enhance the optical mode resonance in interlayer exchange coupled trilayers

Sang, Tao; Zhang, Shouheng; Zhao, Guoxia; Geng, Cunzhen; Jin, Zhejun; Zong, W.; Cao, Derang; Xu, Jie; Wang, Xia; Miao, Guo‐Xing; Li, Shandong

doi:10.1016/j.jallcom.2021.159881

Cited by 6 publications

(2 citation statements)

References 41 publications

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“…The in-plane easy magnetization axis is oriented perpendicular to the incidence plane of the atoms or clusters of flux if incidence angles are less than 60-70 • [13,14]. Nowadays, the method of oblique deposition is very often used for the deposition of films and multilayers and exchange bias structures with varied effective magnetic anisotropy in each one of the layers [15][16][17][18][19][20][21]. The reason is either to control the magnetotransport properties of granular films or to tune the magneto-optical properties of thin films of pitched columnar type.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Anisotropy of FeNi Multilayer Films with Different Orientations of the Magnetic Anisotropy Axes in Adjacent Layers

Svalov,

Lepalovskij,

Rusalina

et al. 2023

Processes

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FeNi films were prepared using the DC magnetron sputtering technique with an oblique deposition arrangement. Multilayers with different orientations of the magnetic anisotropy axes were obtained thanks to a rotary sample holder inside the vacuum chamber. Magnetic properties were studied using magneto–optical Kerr microscopy and a vibrating sample magnetometer. Single-layered FeNi films having thicknesses as high as 10 nm and 40 nm show in-plane uniaxial easy magnetization axes produced by the oblique incidence of incoming components of the beams. Magnetic anisotropy field for four-layered samples with orthogonal uniaxial magnetic anisotropy axes in the adjacent layers and the thickness of individual layers of 10 nm and 40 nm turned out to be less than in single-layered films. The magnetic properties peculiarities of the eight-layered sample FeNi (10 nm) × 8 obtained by rotation of the sample holder by 45° before deposition of each subsequent layer suggest the formation of a helix-like magnetic structure through the thickness of the multilayered sample similar to the magnetization arrangement in the Bloch-type magnetic domain wall.

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Section: Introductionmentioning

confidence: 99%

Magnetic Anisotropy of FeNi Multilayer Films with Different Orientations of the Magnetic Anisotropy Axes in Adjacent Layers

Svalov,

Lepalovskij,

Rusalina

et al. 2023

Processes

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“…In section 2.1.1 it was discussed that some materials do not have any order of magnetic moments, hence orientation of magnetic moments are random [29,30]. Thus, no spontaneous magnetization appear, these are known to be paramagnetic materials.…”

Section: Magnetic Order In Solidsmentioning

confidence: 99%

Synthesis and characterization of magnetic iron oxide nanoparticles.

Ndlovu

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Three high-purity cubic spinel-type crystalline magnetic iron oxides i.e. Fe3O4, CoFe2O4, and NiFe2O4 nanoparticles were successfully synthesized by co-precipitation method. X-ray diffraction (XRD) showed the formation of stoichiometric phases with average particle size of 11.7 nm, 23.6 nm, and 16.4 nm for the as-prepared Fe3O4, CoFe2O4, and NiFe2O4 nanoparticles, respectively. Transmission electron microscopy (TEM) observation for all three samples revealed spherical morphology with single magnetic domain structure. From high resolution TEM (HR-TEM) imaging, lattice fringes with d-spacing of 0.473 nm and 0.248 nm corresponding to (111) and (311) reflections planes, were observed for both the Co-doped and Ni-doped samples. Energy-dispersive x-ray spectroscopy (EDX) analysis showed the presence and homogeneous distribution of main elements Fe, O, Co, and Ni in the samples. Quantitative EDX results confirmed the formation of stoichiometric CoFe2O4 and NiFe2O4 phases with the experimentally measured weight wt% of the samples closely equal to the theoretical calculated wt% values i.e. Fe = 46.35 wt%, O = 26.79 wt%, and Co = 26.87 wt% for CoFe2O4, and Fe = 47.02 wt%, O = 27.27 wt%, and Ni = 24.75 wt% for NiFe2O4. The magnetic properties of these nanoparticles were investigated by 57-Fe Mossbauer spectroscopy (MS) and Vibrating Sample Magnetometer (VSM) techniques. Room temperature MS spectrum for the pure Fe3O4 phase consist of two superimposed sextets with isomer shifts (0.321, 0.463) mm/s and hyperfine field (57.3, 43.4) T attributed to tetrahedral (A-sites) and octahedral (B-sites). The CoFe2O4 and NiFe2O4 samples both showed room temperature MS spectra consisting of two sextets and a single central paramagnetic doublet. The two sextets in each sample had almost equal isomer shifts for both A- and B-sites i.e. 0.2956 & 0.3247 mm/s and 0.3784 & 0.2761 mm/s for each of the sites of the CoFe2O4 and NiFe2O4 sample, respectively. The paramagnetic doublet was fitted with isomer shift of 0.3272 mm/s for the CoFe2O4 sample and 0.3249 mm/s for the NiFe2O4 sample. Temperature dependence M-T magnetization curves measured at H = 500 Oe inthe zero-field-cooled (ZFC) and field-cooled (FC) conditions showed the superparamagnetic nature of all three particles. The MZFC magnetization curve showed a maximum (cusp) at 225 K, 300 K, and 228 K corresponding to blocking temperature (TB), for Fe3O4, CoFe2O4, and NiFe2O4, respectively. For the CoFe2O4 sample the irreversibility temperature (Tirr) was equal to the blocking temperature (TB). While measured Tirr for Fe3O4 and NiFe2O4 was 300 K for both samples. The M-H magnetization curves at 300 K for all three samples revealed the coexistence of ferrimagnetic and superparamagnetic behaviour of the nanoparticles. At 300 K all three samples exhibit symmetrical and almost "closed" hysteresis loops with coercivity approximately 36, 70, and 117 Oe and remanence magnetization of approximately 5, 3, and 4 emu/g, for Fe3O4, NFe2O4, and CoFe2O4, respectively. Furthermore, M-H measurements at 300 K showed a high saturation magnetization of 89 emu/g for the Fe3O4 sample compared to 37 emu/g and 26 emu/g for the CoFe2O4, and NiFe2O4, respectively. M-H measurements recorded at low temperatures showed rather "opened" hysteresis loops compared to loops measured at 300 K. In contrast to saturated magnetization M-H curves for the Fe3O4 and NiFe2O4 nanoparticles, unsaturated M-H loops were observed for CoFe2O4 sample in the temperature range 10 - 100 K. A significant increase in coercivity to 102 Oe, 391 Oe, and 2.4 kOe was observed for Fe3O4, NiFe2O4, and CoFe2O4, respectively, when the temperature was reduced from 300 K to 10 K. For the CoFe2O4 sample, a highest coercivity of 2.7 kOe was measured at 100 K. And finally, M-H data at 10 K showed high saturation magnetization of 100 emu/g, 51 emu/g, and 31 emu/g, for the pure magnetite, CoFe2O4, and NiFe2O4 samples, respectively.

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Inductance andQ‐Factor of Micromagnetic Inductor Are Enhanced by FeCoB Films with Self‐Bias

Sun,

Qiu,

et al. 2024

Physica Rapid Research Ltrs

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As technology progresses, the operational frequencies of electronic devices have migrated into the GHz range. As an important electronic device, the compatibility of the preparation process of inductors with integrated circuits also needs to be improved. Currently, most commercial inductors are constructed from ferrite materials, making them challenging to integrate with integrated circuits. Herein, FeCoB films with a self‐biased ferromagnetic frequency up to 21 GHz are deposited on Si substrates using the compositional gradient sputtering method as a magnetic underlayer. A reasonable inductance structure is designed using HFSS simulation software. A series of planar spiral inductors with various turns are fabricated by photolithographic micromachining on the FeCoB films with a polyimide insertion between them. The preparation process is completely based on semiconductor technology and has good compatibility with integrated circuits. The results show that the inductance L and quality factor Q are greatly improved by the introduction of high‐frequency FeCoB film. The inductance is improved by 71% and the quality factor is improved by 166%. This clearly demonstrates that FeCoB thin films are highly suitable for use as inductor cores and can be seamlessly integrated with integrated circuits, offering excellent prospects for use in high‐frequency integrated circuits.

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Magnetic moment configuration: One of decisive factors to enhance the optical mode resonance in interlayer exchange coupled trilayers

Cited by 6 publications

References 41 publications

Magnetic Anisotropy of FeNi Multilayer Films with Different Orientations of the Magnetic Anisotropy Axes in Adjacent Layers

Magnetic Anisotropy of FeNi Multilayer Films with Different Orientations of the Magnetic Anisotropy Axes in Adjacent Layers

Synthesis and characterization of magnetic iron oxide nanoparticles.

Inductance andQ‐Factor of Micromagnetic Inductor Are Enhanced by FeCoB Films with Self‐Bias

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