Magnetic Anisotropy and Ferromagnetic Resonance in Nitrogen-Incorporated NiFe2O4 Thin Films
01 Feb 2019-IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers (IEEE))-Vol. 55, Iss: 2, pp 2864313
TL;DR: In this article, the in-plane and out-of-plane magnetizations of N-NFO thin films were measured at 20 K and 120 and 140 W, respectively.
Abstract: The nitrogen-incorporated nickel ferrite (N-NFO) thin films deposited by radio-frequency magnetron sputtering were found to exhibit interesting magnetic properties upon heat treatment. The in-plane (IP) and out-of-plane (OP) magnetizations of the heat-treated N-NFO thin films measured at 20 K were seen not to saturate even at higher fields, indicating a large perpendicular magnetic anisotropy (PMA). The coercive field value was found to decrease upon heat treatment, due to the weakened pinning of domain walls upon decrease in grain boundary volume. The IP magnetization exhibits a tendency to saturate at high fields, whereas the OP magnetization does not, indicative of the existence of easy magnetization direction in the plane of the film. The room temperature ferromagnetic resonance (FMR) spectra in both IP and OP configurations indicated the increase of FMR linewidth upon nitrogenation, revealing the increased distribution of magnetic anisotropy induced by nitrogen in the lattice. An increase in the resonance field value was observed for the N-NFO film grown at 100 W compared with that of NFO in the IP configuration, while a decrease in the value was observed for OP, which is attributed to an enhanced IP magnetic anisotropy. The films grown at 120 and 140 W have shown decrease in a resonance field value in the IP configuration and increase in OP, which is attributed to the increase in thickness-dependent PMA.
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TL;DR: The applications of ferrimagnetic oxides or ferrites in the last 10 years are reviewed in this paper, including thin films and nanoparticles, and the general features of the three basic crystal systems and their magnetic structures are briefly discussed, followed by the most interesting applications in electronic circuits as inductors, in high-frequency systems, in power delivering devices, in electromagnetic interference suppression, and in biotechnology.
Abstract: The applications of ferrimagnetic oxides, or ferrites, in the last 10 years are reviewed, including thin films and nanoparticles. The general features of the three basic crystal systems and their magnetic structures are briefly discussed, followed by the most interesting applications in electronic circuits as inductors, in high-frequency systems, in power delivering devices, in electromagnetic interference suppression, and in biotechnology. As the field is considerably large, an effort has been made to include the original references discussing each particular application on a more detailed manner.
72 citations
TL;DR: In this article , a multilayer Pd/Co 2 MnSi (CMS)/NiFe 2 O 4 (NFO)/Pd multilayers were fabricated on F-mica substrate by magnetron sputtering.
Abstract: Abstract Pd/Co 2 MnSi (CMS)/NiFe 2 O 4 (NFO)/Pd multilayers were fabricated on F-mica substrate by magnetron sputtering. The best PMA performance of the multilayer structure Pd(3 nm)/CMS(5 nm)/NFO(0.8 nm)/Pd(3 nm) was obtained by adjusting the thickness of the CMS and NFO layers. F-mica substrate has a flatter surface than glass and Si/SiO 2 substrate. The magnetic anisotropy energy density ( K eff ) of the sample deposited on F-mica substrates is 0.6711 Merg/cm 3 (1 erg=10 −7 J), which is about 30% higher than that of the multilayer films deposited on glass (0.475 Merg/cm 3 ) and Si/SiO 2 (0.511 Merg/cm 3 ) substrates, and the R Hall and H C are also significantly increased. In this study, the NFO layer prepared by sputtering in the high purity Ar environment was exposed to the high purity O 2 atmosphere for 5 min, which can effectively eliminate the oxygen loss and oxygen vacancy in NFO, ensuring enough Co–O orbital hybridization at the interface of CMS/NFO, and thus effectively improve the sample PMA.
5 citations
References
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01 Jan 1997
TL;DR: Magnetic properties of magnetism have been studied in a wide range of applications, including magnetism of amorphous materials, magnetism and magnetostriction as mentioned in this paper, spin distribution and domain walls.
Abstract: 1. Magnetostatic phenomena 2. Magnetic measurements 3. Atomic magnetic moments 4. Macroscopic experimental techniques 5. Magnetic disorder 6. Ferromagnetism 7. Antiferromagnetism and ferrimagnetism 8. Magnetism of metals and alloys 9. Magnetism of ferromagnetic oxides 10. Magnetism of compounds 11. Magnetism of amorphous materials 12. Magnetocrystalline anisotrophy 13. Induced magnetic anisotropy 14. Magnetostriction 15. Observation of domain structures 16. Spin distribution and domain walls 17. Magnetic domain structure 18. Technical magnetization 19. Spin phase transition 20. Dynamic magnetization 21. Various phenomena association with magnetization 22. Engineering applications of magnetic materials
1,486 citations
"Magnetic Anisotropy and Ferromagnet..." refers background in this paper
...N ICKEL ferrite (NiFe2O4 or NFO) is a soft magnetic material having a variety of applications, such as high-frequency devices in magneto-electronics and magnetooptics, sensors, memory devices, and so on [1], [2]....
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...For example, the stoichiometry and size effects can fine-tune its electrical, electronic, and magnetic properties [1], [2], [6]–[8]....
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TL;DR: In this paper, the authors present a review of the development of thin film ferrite technology and device design in planar microwave devices and their magnetic losses related to planar shape and inhomogeneous internal fields.
Abstract: Signal processing requires broadband, low-loss, low-cost microwave devices (circulators, isolators, phase shifters, absorbers). Soft ferrites (garnets, spinels, hexaferrites), applied in planar microwave devices, are reviewed from the point of view of device requirements. Magnetic properties, specific to operation in high-frequency electromagnetic fields, are discussed. Recent developments in thick film ferrite technology and device design are reviewed. Magnetic losses related to planar shape and inhomogeneous internal fields are analyzed.
796 citations
"Magnetic Anisotropy and Ferromagnet..." refers background in this paper
...In particular, nickel ferrite (NFO) thin films are widely used due to their high saturation magnetization, high magnetic permeability, high resistivity, and low losses that make them promising for high-frequency applications [3]–[6]....
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TL;DR: The application of ferrites in non-reciprocal components is discussed, with the emphasis on broadband isolators and circulators, and the ratio fmax/fmin of the frequencies that define the edges of the frequency band is characterized.
Abstract: The application of ferrites in non-reciprocal components is discussed, with the emphasis on broadband isolators and circulators. The performance of such devices may be characterized by the ratio fmax/fmin of the frequencies that define the edges of the frequency band, within which satisfactory performance has been achieved. For the best currently available devices this ratio is approx. 3 : 1, but larger values appear feasible according to a detailed analysis of the `low-field, low-frequency loss’ that limits the performance.
116 citations
"Magnetic Anisotropy and Ferromagnet..." refers background in this paper
...In particular, nickel ferrite (NFO) thin films are widely used due to their high saturation magnetization, high magnetic permeability, high resistivity, and low losses that make them promising for high-frequency applications [3]–[6]....
[...]
...For example, the stoichiometry and size effects can fine-tune its electrical, electronic, and magnetic properties [1], [2], [6]–[8]....
[...]
TL;DR: In this paper, nanocrystalline CoFe1.9RE0.1O4 [rare earth (Gd,Tb,Dy)] films have been prepared by the sol-gel route, and their polar magneto-optical (MO) Kerr rotation and ellipticity have been determined in the spectral range of 4000-8000 A. The films are composed of nanometer grains with the spinel structure.
Abstract: Nanocrystalline CoFe1.9RE0.1O4 [rare earth (RE=Gd,Tb,Dy)] films have been prepared by the sol–gel route, and their polar magneto-optical (MO) Kerr rotation and ellipticity have been determined in the spectral range of 4000–8000 A. The films are composed of nanometer grains with the spinel structure. RE doped cobalt spinel ferrites are found to have dramatic changes in magnetic and MO properties, with increases in their coercive force and enhancement of the MO rotation in the Tb3+ doped sample.
113 citations
"Magnetic Anisotropy and Ferromagnet..." refers background in this paper
...However, the magnetic and electronic properties of ferrite thin films are very sensitive to growth conditions and the method of fabrication [7], [8]....
[...]
...For example, the stoichiometry and size effects can fine-tune its electrical, electronic, and magnetic properties [1], [2], [6]–[8]....
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TL;DR: LiZn ferrite films of composition Li00.5−x/2Mn0.1ZnxFe2.32 with x=0.32 were found by x-ray diffraction to be amorphous but magnetic and showed large high field susceptibility as discussed by the authors.
Abstract: LiZn ferrite films of composition Li00.5−x/2Mn0.1ZnxFe2.35−x/2O4 with x=0.32 were rf sputter deposited on fused quartz substrates at ambient temperature. The as-deposited films were found by x-ray diffraction to be amorphous but magnetic, and showed large high field susceptibility. The films were studied after they were annealed at various temperatures up to 850 °C. It was observed that the films crystallize upon annealing and the value of the saturation magnetization increases with annealing temperature. The high field susceptibility, on the other hand, decreases with increasing anneal temperature. The measured ferromagnetic resonance spectra of these films indicated that the films consist of at least two different magnetic materials. A significant portion in the film crystallizes and the value of saturation magnetization of this portion tends to the bulk value as annealing temperature is increased. However, a small portion of the film remains in a highly defective state all through, even up to annealing...
85 citations
"Magnetic Anisotropy and Ferromagnet..." refers background in this paper
...Under certain specific growth conditions, ferrite thin films prepared by sputtering have been reported to be nanocrystalline, and their magnetic properties are entirely different from those of their bulk counterparts [11], [12]....
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