New technique to determine the magnetic easy axis orientation in recording media

2005 ◽  
Vol 97 (10) ◽  
pp. 10N115 ◽  
Author(s):  
A. Berger ◽  
E. Marinero ◽  
M. Doerner ◽  
X. Bian ◽  
K. Tang ◽  
...  
Keyword(s):  
Easy Axis ◽  
New Technique ◽  
Recording Media ◽  
Axis Orientation ◽  
Magnetic Easy Axis

2D Magnetic Texture Analysis of Co–Cu Films

2017 ◽  
Vol 72 (5) ◽  
pp. 449-455 ◽  
Author(s):  
Mehmet Bayirli ◽  
Oznur Karaagac ◽  
Hakan Kockar ◽  
Mursel Alper
Keyword(s):  
Fourier Series ◽  
Texture Analysis ◽  
Easy Axis ◽  
Hysteresis Loops ◽  
X Ray Diffraction ◽  
Axis Orientation ◽  
Magnetic Texture ◽  
X Ray ◽  
Cu Films ◽  
Magnetic Easy Axis

AbstractThe magnetic textures for the produced magnetic materials are important concepts in accordance with technical applications. Therefore, the aim of this article is to determine 2D magnetic textures of electrodeposited Co–Cu films by the measurement of hysteresis loops at the incremented angles. For that, Co–Cu films were deposited with different Co2+ in the electrolyte. In addition, the easy-axis orientation in the films from the squareness values of the angles, Mp(β) obtained by the hysteresis loops have been numerically studied using the Fourier series analysis. The differences observed in the magnetic easy-axis distributions were attributed to changes of the incorporation of Co in the films with the change of Co2+ in the electrolyte. The coefficients of Fourier series (A0 and A2n ) were also computed for 2D films. It is seen that a systematic and small decrease in A0 and an obvious decrease in A2n (n=1) were observed with increasing incorporated Co in the films. Results imply that interactions cause slightly demagnetization effect accordance with higher incorporation of Co in the films. Furthermore, the crystal structure of the Co–Cu films analysed by X-ray diffraction revealed that the films have dominantly face-centred cubic structure. Film contents analysed by energy-dispersive X-ray spectroscopy and film morphologies observed by scanning electron microscope also support the magnetic texture analysis results found by numerical computation.

Microstructure and Magnetic Properties of C-Axis-Oriented Mo/NdFeB/Mo Films

2012 ◽  
Vol 271-272 ◽  
pp. 343-346 ◽  
Author(s):  
Wen Feng Liu ◽  
Kai Zhang ◽  
Hai Jie Zhang
Keyword(s):  
Magnetic Properties ◽  
Magnetron Sputtering ◽  
Easy Axis ◽  
Film Plane ◽  
Dc Magnetron Sputtering ◽  
Axis Orientation ◽  
Si Substrates ◽  
Magnetic Easy Axis ◽  
Microstructure And Magnetic Properties

Mo/NdFeB/Mo thin flms were deposited by dc-magnetron sputtering onto Si substrates, then were annealed at 650 °C for 30 min. Nanostructured Mo/NdFeB/Mo films were successfully obtained with the magnetic easy axis of NdFeB perpendicular to the film plane. It was found that the c-axis orientation depends on the NdFeB sputter power. Good c-axis orientation was obtained at 40W NdFeB sputter power. Meanwhile, Mo layer can not only induce the c-axis orientation of NdFeB, but also improve the crystallization of NdFeB grains.

Determination of Texture Orientation Related Magnetic Properties of Nickel-Cobalt Films

2010 ◽  
Vol 65 (4) ◽  
pp. 342-346 ◽  
Author(s):  
Mehmet Bayirli ◽  
Hakan Kockar ◽  
Mursel Alper ◽  
Emrah Cokturen
Keyword(s):  
Easy Axis ◽  
Hysteresis Loops ◽  
Face Centered Cubic ◽  
Axis Orientation ◽  
X Ray ◽  
A Value ◽  
Nickel Cobalt ◽  
Magnetic Easy Axis ◽  
Face Centered

The determination of texture effects in nickel-cobalt (Ni-Co) films with different thickness, which were obtained by electrodeposition, has been investigated by the measurement of hysteresis loops at different angles. Easy-axis distribution measurements were performed as a function of the squareness Mp(β ) and the correlations were established among the different thicknesses. The composition of Ni- Co films was determined by energy dispersive X-ray spectroscopy. The structural analysis made by X-ray diffraction revealed that all films have a polycrystalline face-centered cubic structure but their texture degrees vary depending on the film thickness. The determination of the easy-axis orientation in 2-D films from the Mp(β ) obtained by the hystersis loops was studied using Fourier series analyses. The coefficient A0 have a value of less then unity while A2 is inversely proportional to the width of the distribution function which may cause the change in the texture preferential orientations. Therefore, the differences observed in the magnetic easy-axis distributions were attributed to the changes in texture orientations caused by the compositional differences at different thicknesses of the polycrystalline films.

scholarly journals Out-of-Plane Magnetic Anisotropy in Ordered Ensembles of FeyN Nanocrystals Embedded in GaN

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3294
Author(s):  
Andrea Navarro-Quezada ◽  
Katarzyna Gas ◽  
Tia Truglas ◽  
Viola Bauernfeind ◽  
Margherita Matzer ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Easy Axis ◽  
Magnetic Nanostructures ◽  
Growth Direction ◽  
Strain Engineering ◽  
Recording Media ◽  
Perpendicular Recording ◽  
Out Of Plane ◽  
High Density Recording ◽  
Magnetic Easy Axis

Phase-separated semiconductors containing magnetic nanostructures are relevant systems for the realization of high-density recording media. Here, the controlled strain engineering of GaδFeN layers with FeyN embedded nanocrystals (NCs) via AlxGa1−xN buffers with different Al concentration 0<xAl<41% is presented. Through the addition of Al to the buffer, the formation of predominantly prolate-shaped ε-Fe3N NCs takes place. Already at an Al concentration xAl≈ 5% the structural properties—phase, shape, orientation—as well as the spatial distribution of the embedded NCs are modified in comparison to those grown on a GaN buffer. Although the magnetic easy axis of the cubic γ’-GayFe4−yN nanocrystals in the layer on the xAl=0% buffer lies in-plane, the easy axis of the ε-Fe3N NCs in all samples with AlxGa1−xN buffers coincides with the [0001] growth direction, leading to a sizeable out-of-plane magnetic anisotropy and opening wide perspectives for perpendicular recording based on nitride-based magnetic nanocrystals.

Experimental and theoretical evidence that electrostatics governs easy-axis orientation in DyIII-based molecular chains

2014 ◽  
Vol 50 (87) ◽  
pp. 13346-13348 ◽  
Author(s):  
Julie Jung ◽  
François Le Natur ◽  
Olivier Cador ◽  
Fabrice Pointillart ◽  
Guillaume Calvez ◽  
...  
Keyword(s):  
Single Crystal ◽  
Ab Initio ◽  
Easy Axis ◽  
Molecular Chain ◽  
Slow Relaxation ◽  
Axis Orientation ◽  
Magnetic Easy Axis ◽  
Theoretical Evidence

Magnetic slow relaxation is observed in a DyIII-based molecular chain and the magnetic easy-axis is determined via single-crystal magnetometry and ab initio calculations.

Expansion and Collapse of Domains With Reverse Magnetization in (Ga,Mn)As Epilayers With Perpendicular Magnetic Easy Axis

2007 ◽  
Vol 43 (6) ◽  
pp. 3022-3024 ◽  
Author(s):  
A. Dourlat ◽  
C. Gourdon ◽  
V. Jeudy ◽  
C. Testelin ◽  
K. Khazen ◽  
...  
Keyword(s):  
Easy Axis ◽  
Magnetic Easy Axis ◽  
Reverse Magnetization
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