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.

scholarly journals Strain-induced perpendicular magnetic anisotropy and Gilbert damping of Tm3Fe5O12 thin films

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Oana Ciubotariu ◽  
Anna Semisalova ◽  
Kilian Lenz ◽  
Manfred Albrecht
Keyword(s):  
Film Thickness ◽  
Magnetic Anisotropy ◽  
Tensile Strain ◽  
Easy Axis ◽  
Perpendicular Magnetic Anisotropy ◽  
Gilbert Damping ◽  
Sample Plane ◽  
Iron Garnets ◽  
Out Of Plane ◽  
Magnetic Easy Axis

AbstractIn the attempt of implementing iron garnets with perpendicular magnetic anisotropy (PMA) in spintronics, the attention turned towards strain-grown iron garnets. One candidate is Tm3Fe5O12 (TmIG) which possesses an out-of-plane magnetic easy axis when grown under tensile strain. In this study, the effect of film thickness on the structural and magnetic properties of TmIG films including magnetic anisotropy, saturation magnetization, and Gilbert damping is investigated. TmIG films with thicknesses between 20 and 300 nm are epitaxially grown by pulsed laser deposition on substituted-Gd3Ga5O12(111) substrates. Structural characterization shows that films thinner than 200 nm show in-plane tensile strain, thus exhibiting PMA due to strain-induced magnetoelastic anisotropy. However, with increasing film thickness a relaxation of the unit cell is observed resulting in the rotation of the magnetic easy axis towards the sample plane due to the dominant shape anisotropy. Furthermore, the Gilbert damping parameter is found to be in the range of 0.02 ± 0.005.

Sharrock Relation for Perpendicular Recording Media with Higher-Order Magnetic Anisotropy Terms

2003 ◽  
Vol 43 (1A/B) ◽  
pp. L115-L117 ◽  
Author(s):  
Osamu Kitakami ◽  
Takehito Shimatsu ◽  
Satoshi Okamoto ◽  
Yutaka Shimada ◽  
Hajime Aoi
Keyword(s):  
Magnetic Anisotropy ◽  
Higher Order ◽  
Recording Media ◽  
Perpendicular Recording

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

scholarly journals Correlation-driven eightfold magnetic anisotropy in a two-dimensional oxide monolayer

2020 ◽  
Vol 6 (15) ◽  
pp. eaay0114 ◽  
Author(s):  
Zhangzhang Cui ◽  
Alexander J. Grutter ◽  
Hua Zhou ◽  
Hui Cao ◽  
Yongqi Dong ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Easy Axis ◽  
Uniaxial Anisotropy ◽  
Spin Reorientation ◽  
Spin Orbit ◽  
Two Dimensional ◽  
Orbital Ordering ◽  
Magnetic Easy Axis ◽  
Spin Orbit Interactions ◽  
Spin Switching

Engineering magnetic anisotropy in two-dimensional systems has enormous scientific and technological implications. The uniaxial anisotropy universally exhibited by two-dimensional magnets has only two stable spin directions, demanding 180° spin switching between states. We demonstrate a previously unobserved eightfold anisotropy in magnetic SrRuO3 monolayers by inducing a spin reorientation in (SrRuO3)1/(SrTiO3)N superlattices, in which the magnetic easy axis of Ru spins is transformed from uniaxial 〈001〉 direction (N < 3) to eightfold 〈111〉 directions (N ≥ 3). This eightfold anisotropy enables 71° and 109° spin switching in SrRuO3 monolayers, analogous to 71° and 109° polarization switching in ferroelectric BiFeO3. First-principle calculations reveal that increasing the SrTiO3 layer thickness induces an emergent correlation-driven orbital ordering, tuning spin-orbit interactions and reorienting the SrRuO3 monolayer easy axis. Our work demonstrates that correlation effects can be exploited to substantially change spin-orbit interactions, stabilizing unprecedented properties in two-dimensional magnets and opening rich opportunities for low-power, multistate device applications.

Comparison of magnetic anisotropy and magnetization reversal in perpendicular recording media

1995 ◽  
Vol 77 (12) ◽  
pp. 6675-6680 ◽  
Author(s):  
B. M. Lairson ◽  
W. Liu ◽  
A. P. Payne ◽  
C. Baldwin ◽  
H. Hamilton
Keyword(s):  
Magnetic Anisotropy ◽  
Magnetization Reversal ◽  
Recording Media ◽  
Perpendicular Recording

Magnetic Anisotropy and Growth Texture in Co35Pd65 Films

1997 ◽  
Vol 475 ◽  
Author(s):  
S. U. Jen ◽  
J. Y. Huang ◽  
K. B. Huang
Keyword(s):  
Magnetic Anisotropy ◽  
Saturation Magnetization ◽  
Easy Axis ◽  
Profile Analysis ◽  
Surface Topology ◽  
Perpendicular Anisotropy ◽  
Atomic Force ◽  
Squareness Ratio ◽  
Out Of Plane ◽  
Pd Alloy

ABSTRACTPd-rich Co-Pd alloy films are well known to exhibit perpendicular anisotropy. In this study, Co35Pd65 films were made by the vapor deposition method. The thickness of the films ranged from 80 to 2000 Å. Following measurements were carried out on each film sample: the impurities and alloy compositions were checked by Auger depth profile analysis (AES), the surface topology was mapped out by an atomic force microscope (AFM), the structural analysis was done by using the X-ray diffractometer (XRD), and the magnetic properties, such as magnetic anisotropy and saturation magnetization, were measured by a SQUID magnetometer and/or a MOKE (using the longitudinal or polar effect) apparatus. Magnetic quantities, such as the out-of-plane (either hard or easy axis) squareness ratio Mr/Ms, saturation magnetization Ms, and anisotropy energy Ku, are closely related to the structural properties, such as the degree of (111) texture, grain size D, mode of growth (nucleation texture or growth texture), and impurities in films. The emphasis is placed on the thickness dependence of these quantities, and the interrelationship among them.

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