Effect of substrate temperature on structural, static and dynamic magnetic properties of FeSi/(001) MgO films

2021 ◽  
Author(s):  
Xiaobin Guo ◽  
Xiaoling Lu ◽  
Fengchao Su ◽  
Wenhai Qiu ◽  
Zheng Su ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Substrate Temperature ◽  
Magnetocrystalline Anisotropy ◽  
Practical Application ◽  
Radio Frequency Magnetron Sputtering ◽  
Uniaxial Magnetic Anisotropy ◽  
Maximum Value ◽  
Three Stages ◽  
Coercivity Field

Abstract FeSi films with different substrate temperature (Ts) were deposited on MgO (001) substrates by a radio frequency magnetron sputtering. During the change of crystal structure from amorphous epitaxial state, magnetic anisotropy experienced three stages: dominant uniaxial magnetic anisotropy (Ts < 400 ℃) and enhanced cubic magnetocrystalline anisotropy (400 ℃ £ Ts £ 600 ℃) and weak cubic magnetocrystalline anisotropy (Ts = 700 ℃ and 800 ℃). In addition, resonance frequency ƒr firstly decreases, then reaches the maximum value, and finally disappears due to the large coercivity field. These results demonstrate the correlation between the structure, static, dynamic magnetic properties of FeSi films, and provide an effective method to prepare soft films with deterministic uniaxial or cubic magnetic anisotropy for practical application.

Effects of the Co-Presence of Conflicting Magnetic Anisotropy in Ba Ferrite Particles

2010 ◽  
Vol 67 ◽  
pp. 108-112
Author(s):  
Giancarlo Bottoni
Keyword(s):  
Thermal Stability ◽  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Low Temperatures ◽  
Magnetocrystalline Anisotropy ◽  
Shape Anisotropy ◽  
Recording Media ◽  
Magnetization Switching ◽  
Crystalline Anisotropy ◽  
Thermal Stability Of

In Ba ferrite particles magnetocrystalline and shape anisotropies are contemporarily present and conflicting. The strength and evolution of the two anisotropies are studied, through the dependence of the anisotropy constants on temperature. While in pure Ba ferrite particles the anisotropy is uniaxial at all temperatures, since the magnetocrystalline anisotropy clearly prevails on shape anisotropy, in particles modified for employment in recording media the two anisotropies are comparable and at low temperatures the shape anisotropy result stronger than the crystalline anisotropy. Besides the irregular shape of the particles introduces further preferred directions for the magnetization. The Co/Ti-doped particles show a multiple axes anisotropy. The macroscopic magnetic properties are found in relationship with the evolution of the anisotropy. Also the influence that the presence of such multiple anisotropy has on the magnetization switching and on the thermal stability of the magnetization of the Ba ferrite particles is analyzed.

Magnetic properties of thin hard/soft-stacked dot arrays with a large uniaxial magnetic anisotropy

2009 ◽  
Vol 105 (7) ◽  
pp. 07C103 ◽  
Author(s):  
K. Mitsuzuka ◽  
T. Shimatsu ◽  
N. Kikuchi ◽  
O. Kitakami ◽  
H. Muraoka ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Uniaxial Magnetic Anisotropy

Magnetic anisotropy of Sm2Fe17−xGax hydrides

1993 ◽  
Vol 71 (11-12) ◽  
pp. 574-577 ◽  
Author(s):  
R. A. Dunlap ◽  
Z. Wang
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Room Temperature ◽  
Single Phase ◽  
Easy Axis ◽  
Phase 2 ◽  
Planar Anisotropy ◽  
Uniaxial Magnetic Anisotropy ◽  
Diffusion Of Hydrogen ◽  
Hard Magnetic Properties

The magnetic properties of single-phase 2:17 compounds of the composition Sm2Fe17−xGaxHy were investigated. The substitution of Ga for Fe in the Sm2Fe17 compound resulted in a substantial increase in the Curie temperature and, for alloys with x > 2, the formation of a uniaxial magnetic anisotropy at room temperature. The diffusion of hydrogen into those compounds that exhibit an easy axis anisotropy causes a transition back to a planar anisotropy. This indicates that the presence of interstitial hydrogen is detrimental to the hard magnetic properties of these materials.

Growth of La1-xBaxCoO3 Single Crystals and their Structural and Magnetic Properties

2013 ◽  
Vol 596 ◽  
pp. 26-30
Author(s):  
Toru Kyomen ◽  
Takumi Nozawa ◽  
Minoru Hanaya
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Single Crystals ◽  
Gas Flow ◽  
Magnetocrystalline Anisotropy ◽  
Hysteresis Loops ◽  
Mixed Gas ◽  
Twin Boundaries ◽  
Structural And Magnetic Properties

La1-xBaxCoO3single crystals were grown from KOH melt at 873 K under H2O/O2mixed gas flow. The grown crystals had a parallelepiped form with the edges of about 60 μm. Streaks indicating twin boundaries were observed on the surface planes of the crystals. The crystals showed magnetic anisotropy and anomalousMHhysteresis loops. The magnetocrystalline anisotropy and coupling of ferroelasticity and ferromagnetism were discussed based on the magnetic properties.

Substructure-Magnetic Property Correlation in Co/ag Composite Thin Films

1991 ◽  
Vol 231 ◽  
Author(s):  
C.P Reed ◽  
R.J. Deangelis ◽  
S.H. Liou ◽  
S. Nafis ◽  
John A. Woollam ◽  
...  
Keyword(s):  
Thin Films ◽  
Particle Size ◽  
Magnetic Properties ◽  
Magnetic Property ◽  
Substrate Temperature ◽  
Lattice Structure ◽  
Dc Magnetron Sputtering ◽  
Composite Thin Films ◽  
Maximum Value ◽  
Substrate Temperatures

AbstractThree series of nanostructured, μm thick, Co/Ag composite thin films (13, 39 and 61 volume % Co) were produced by dc magnetron sputtering at various substrate temperatures (100–600°C) to determine their magnetic properties and characterize the microstructure. The films were found to be composed of finely dispersed Ag and Co particles. The film surfaces become rougher as the substrate temperature was increased. The crystal lattice structure of the Co was found to be fcc except at the lower substrate temperatures (<300°C) in the 61 volume % films where it was found to be a mixture of fcc and some hcp. The average diffracting particle size of both the Co and Ag rich phases increase with substrate temperature. The magnetic coercivity of the films reached a maximum value when the Co particle size was between 100–150Å.

Uniaxial magnetic anisotropy in electrodeposited thin films arising from lattice distortion

1968 ◽  
Vol 46 (20) ◽  
pp. 2259-2262 ◽  
Author(s):  
J. E. Fisher
Keyword(s):  
Thin Films ◽  
Magnetic Anisotropy ◽  
Single Crystal ◽  
Lattice Distortion ◽  
Magnetocrystalline Anisotropy ◽  
Uniaxial Anisotropy ◽  
Uniaxial Magnetic Anisotropy ◽  
Nickel Thin Films ◽  
Planar Film

The usual expression for the magnetocrystalline anisotropy is rewritten for the magnetization referred to the easy axes of the f.c.c. lattice. It is suggested that distortion due to planar film strain produces easy directions different from the [Formula: see text] crystallographic directions and results in the appearance of a large uniaxial anisotropy, Ku, superimposed upon the expected magnetocrystalline anisotropy. A strain of 1 × 10−4 in nickel is considered and is shown to produce a Ku of the order of 105 erg cm−3, comparable with that measured experimentally on electrodeposited (110) single-crystal nickel thin films.

scholarly journals Non-Volatile Regulation of Magnetism via Electric Fields in Polycrystal FeSi/(011) PMN-0.32PT Heterostructures

2020 ◽  
Vol 6 (4) ◽  
pp. 57
Author(s):  
Xiaobin Guo ◽  
Fengchao Su ◽  
Xiaoling Lu ◽  
Xingui Tang ◽  
Zhenhua Tang ◽  
...  
Keyword(s):  
Magnetron Sputtering ◽  
Magnetic Anisotropy ◽  
Radio Frequency ◽  
Electric Fields ◽  
Magnetocrystalline Anisotropy ◽  
Radio Frequency Magnetron Sputtering ◽  
Polycrystalline Structure ◽  
High Quality ◽  
Single Crystalline ◽  
Low Crystalline

The choice and configuration of the ferroelectric (FE) substrate and the ferromagnetic (FM) layer in FM/FE heterostructures play an important role in magnetism modification with regard to amplitude and efficiency. In this study, we fabricated FeSi films on low crystalline (011) [Pb(Mg1/3Nb2/3)O3]0.7-[PbTiO3]0.3 (PMN-0.32PT) using radio frequency magnetron sputtering. In the annealed FeSi/(011) PMN-0.32PT heterostructures, the FeSi film presented with a (011) preferred orientated polycrystalline structure and low magnetocrystalline anisotropy. Both loop-like and butterfly-like magnetism modifications were observed by applying bipolar electric fields, and the weak and abnormal electrically mediated magnetism behaviors were significantly different from the prominent magnetic anisotropy transition in FeSi/(011) PMN-0.3PT. The comparative analyses suggest that the resulting high-quality single-crystalline PMN-xPT and FM films with low coercivity are of great significance for exploring giant, reversible, and non-volatile magnetism regulation.

scholarly journals Anomalous Nernst effect in stressed magnetostrictive film grown onto flexible substrate

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Acácio Silveira Melo ◽  
Alexandre Barbosa de Oliveira ◽  
Carlos Chesman ◽  
Rafael Domingues Della Pace ◽  
Felipe Bohn ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Electronic Devices ◽  
External Stress ◽  
Voltage Response ◽  
Nernst Effect ◽  
Uniaxial Magnetic Anisotropy ◽  
Thermoelectric Voltage ◽  
Magnetostrictive Film ◽  
Anomalous Nernst Effect

Abstract The anomalous Nernst effect in nanostructured magnetic materials is a key phenomenon to optimally control and employ the internal energy dissipated in electronic devices, being dependent on, for instance, the magnetic anisotropy of the active element. Thereby, here, we report a theoretical and experimental investigation of the magnetic properties and anomalous Nernst effect in a flexible magnetostrictive film with induced uniaxial magnetic anisotropy and under external stress. Specifically, we calculate the magnetization behavior and the thermoelectric voltage response from a theoretical approach for a planar geometry, with magnetic free energy density that takes into account the induced uniaxial and magnetoelastic anisotropy contributions. Experimentally, we verify modifications of the effective magnetic anisotropy by changing the external stress, and explore the anomalous Nernst effect, a powerful tool to investigate the magnetic properties of magnetostrictive materials. We find quantitative agreement between experiment and numerical calculations, thus elucidating the magnetic behavior and thermoelectric voltage response. Besides, we provide evidence to confirm the validity of the theoretical approach to describe the magnetic properties and anomalous Nernst effect in ferromagnetic magnetostrictive films having uniaxial magnetic anisotropy and submitted to external stress. Hence, the results place flexible magnetostrictive systems as promising candidates for active elements in functionalized touch electronic devices.

Dynamics and magnetic properties of NO molecules encapsulated in open-cage fullerene derivatives evidenced by low temperature heat capacity

2021 ◽  
Author(s):  
Yoji Horii ◽  
Hal Suzuki ◽  
Yuji Miyazaki ◽  
Motohiro Nakano ◽  
Shota Hasegawa ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Magnetic Properties ◽  
Low Temperature ◽  
Magnetic Anisotropy ◽  
Fullerene Derivatives ◽  
Molecular Cages ◽  
Temperature Heat ◽  
Low Temperature Heat Capacity

Heat capacity analyses revealed dynamics and magnetic anisotropy of NO molecules confined in molecular cages.

Deciphering the influence of structural distortions on the uniaxial magnetic anisotropy of pentagonal bipyramidal Ni(ii) complexes

2019 ◽  
Vol 55 (77) ◽  
pp. 11547-11550
Author(s):  
Mamon Dey ◽  
Prashurya Pritam Mudoi ◽  
Anup Choudhury ◽  
Bipul Sarma ◽  
Nayanmoni Gogoi
Keyword(s):  
Magnetic Anisotropy ◽  
Structural Distortion ◽  
Uniaxial Magnetic Anisotropy ◽  
Simple Strategy ◽  
Structural Distortions

Role of structural distortion on the uniaxial magnetic anisotropy of pentagonal bipyramidal Ni(ii) complexes is explored. A simple strategy to enhance the uniaxial magnetic anisotropy in pentagonal bipyramidal Ni(ii) complexes is proposed.

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