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.

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.

Substrate-Deposition-Teiimperatijre Dependence of Perpendicular Magnetic Anisotropy in (Fe/Pt) Compositionally-Modulated Films

1991 ◽  
Vol 232 ◽  
Author(s):  
S. Iwata ◽  
S. S. P. Parkin ◽  
H. Nuri ◽  
T. Suzuki
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Saturation Magnetization ◽  
Systematic Study ◽  
Deposition Temperature ◽  
Major Part ◽  
Perpendicular Magnetic Anisotropy ◽  
Perpendicular Anisotropy ◽  
Elastic Effect

ABSTRACTA systematic study on magnetic properties of (Fc/Pt) compositionally-modulated films as a function of substrate-deposition-temperature has been carried out. For films with (2.5ÅFe/18ÅPt)×40, the intrinsic perpendicular magnetic anisotropy Ku is found to increase with decreasing temperature for all the sarmples deposited at temperatures from -114 °C to 220°C during deposition. The higher the substrate-deposition-temperature, the larger the Ku values become. This result implies a possible contribution from the magne to-elastic effect to the total anisotropy. However, a major part responsible for the perpendicular anisotropy may be found in other mechanisms. The saturation magnetization is found to exceed the value for pure Fe at temperatures lower than 180K.

MAGNETIC ANISOTROPY OF CoFeB AMORPHOUS NANOTUBES PREPARED BY ELECTROLESS PLATING IN MAGNETIC FIELD

2013 ◽  
Vol 27 (19) ◽  
pp. 1341006 ◽  
Author(s):  
Z. LIU ◽  
W. L. LI ◽  
W. D. FEI
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Electroless Plating ◽  
Applied Field ◽  
Anodized Aluminum ◽  
Anodized Aluminum Oxide ◽  
Squareness Ratio ◽  
Out Of Plane ◽  
Structural And Magnetic Properties

CoFeB nanotubes were fabricated by electroless plating in magnetic field using anodized aluminum oxide template, and the structural and magnetic properties of CoFeB nanotubes were investigated. It is found that some nano-scale particles form on the wall of nanotubes. Both coercivity ratio and squareness ratio of out-of-plane to in-plane are significantly changed by the applied magnetic field during electroless plating, which indicates that directional ordering in amorphous CoFeB nanotubes are achieved during electroless plating under magnetic field. The results show that the applied field impacts the magnetic anisotropy of amorphous nanotubes. The anisotropy is stronger with the magnitude of applied field increasing.

Perpendicular Magnetic Anisotropy in Nanostructured Pseudomorphic Fe(110) Films on W(110)

1997 ◽  
Vol 475 ◽  
Author(s):  
H.J. Elmers ◽  
N. Weber ◽  
K. Wagner ◽  
J. Hauschild ◽  
U. Gradmann
Keyword(s):  
Magnetic Anisotropy ◽  
Exchange Interaction ◽  
Double Layer ◽  
Room Temperature ◽  
Easy Axis ◽  
Perpendicular Magnetic Anisotropy ◽  
Film Plane ◽  
Perpendicular Anisotropy ◽  
Lateral Scale

ABSTRACTPseudomorphic Fe(110) films, deposited on W(110) at room temperature, with a mean thickness of 1.5 monolayers. are composed of double layer islands with a diameter of the order of 10 nm on a monolayer sea. The double layer islands are ferromagnetic (superparamagnetic) below 500 K, the monolayer sea becomes ferromagnetic below 222 K. Magnetic anisotropy is uniaxial in both components. The easy axis is perpendicular to the film plane in the double layer islands and within the film plane (along [110]) in the monolayer sea. The perpendicular anisotropy in the double layer islands apparently is caused by the pseudomorphic strain. The lateral scale for the anisotropy switching roughly coincides with the exchange lengths in both media. The strength of the exchange interaction between double layer islands rapidly increases when the monolayer sea becomes ferromagnetic.

Effects of Ferromagnetic Capping Layers on the Perpendicular Anisotropy of Ni/Cu(001) Films.

1994 ◽  
Vol 375 ◽  
Author(s):  
W. L. O'Brien ◽  
B. P. Tonner
Keyword(s):  
Magnetic Anisotropy ◽  
Easy Axis ◽  
Magnetic Circular Dichroism ◽  
Hysteresis Loops ◽  
Perpendicular Magnetic Anisotropy ◽  
Perpendicular Anisotropy ◽  
Magnetic Orientation ◽  
Capping Layer ◽  
X Ray ◽  
Perpendicular Magnetization

The effects of ferromagnetic capping layers on the perpendicular magnetic anisotropy of Ni/Cu(001) have been studied. X-ray magnetic circular dichroism was used to obtain element specific magnetic information, including hysteresis loops for both in-plane and perpendicular magnetization. A 15 ML Ni/Cu(001) film maintains its perpendicular magnetic orientation after the addition of a 2.5 ML Fe capping layer. The Fe capping layer reduces the area of the Ni hysteresis loop by a factor of 2.0. A 2.0 ML capping layer of Co on 15 ML Ni/Cu(001) switches the easy axis of magnetization from perpendicular to in-plane.

Out-of-plane magnetic anisotropy energy in the Ni3Bz3 molecule

2019 ◽  
Vol 21 (9) ◽  
pp. 5305-5311
Author(s):  
Tomás Alonso-Lanza ◽  
Jhon W. González ◽  
Faustino Aguilera-Granja ◽  
Andrés Ayuela
Keyword(s):  
Magnetic Anisotropy ◽  
Easy Axis ◽  
Anisotropy Energy ◽  
Magnetic Anisotropy Energy ◽  
Metal Atoms ◽  
Out Of Plane

Ni3Bz3 molecule shows a large magnetic anisotropy energy of 8 meV, with the easy axis perpendicular to the plane of Ni metal atoms. Note that the corresponding bare Ni3 cluster has an in-plane easy axis.

Strong Perpendicular Magnetic Anisotropy with High Thermal Stability in Annealed Co/Native Oxide/Pd Multilayers

2013 ◽  
Vol 634-638 ◽  
pp. 2506-2511
Author(s):  
Qin Li Lv ◽  
Jian Wang Cai ◽  
Tao Li
Keyword(s):  
Thermal Stability ◽  
Magnetic Anisotropy ◽  
Annealing Temperature ◽  
Perpendicular Magnetic Anisotropy ◽  
Anisotropy Field ◽  
High Thermal Stability ◽  
Native Oxide ◽  
Perpendicular Anisotropy ◽  
Sharp Transition ◽  
Out Of Plane

A novel perpendicular magnetic material was obtained in the annealed Co/native oxide/Pd multilayer films. Upon thermal annealing in a vacuum, a sharp transition of magnetic anisotropy from in-plane to out-of-plane is observed for the Co/native oxide/Pd multilayers with 20 Å Co layers. These annealed Co/native oxide/Pd multilayers possess extremely large effect perpendicular anisotropy field (Heff) and perpendicular anisotropy energy (Ku), with the maximum Heff of 17 kOe and Ku of 5.1×106 erg/cm3 obtained in the annealed Co(20 Å)/native oxide/Pd(10 Å) multilayers. Moreover, the large perpendicular magnetic anisotropy sustains with annealing temperature varying from 200°C to 400°C, indicative of high thermal stability. The present results open the way to a third alternative for the realization of thermally stable perpendicular magnetic electrodes of tunnel junctions.

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.

Microstructural Dependence of the Perpendicular Magnetic Anisotropy in Co-Pt Alloys

1993 ◽  
Vol 313 ◽  
Author(s):  
E. E. Marinero ◽  
R. F. C. Farrow ◽  
G. R. Harp ◽  
R. H. Geiss ◽  
J. A. Bain ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Temperature Dependence ◽  
Elevated Temperatures ◽  
Perpendicular Magnetic Anisotropy ◽  
Strong Temperature Dependence ◽  
Perpendicular Anisotropy ◽  
Chemical Ordering ◽  
Polycrystalline Alloys ◽  
Out Of Plane ◽  
Pt Alloys

ABSTRACTTo establish the structural origins of the perpendicular magnetic anisotropy in Co-Pt alloys, a variety of magnetic and structural characterization techniques have been utilized. We have determined that the development of out-of-plane magnetization in these alloys, strongly depends on growth temperature and in contrast to CO/Pt Multilayers, the highest anisotropics and coercivities are observed in polycrystalline alloys with negligible preferred crystallographic orientation. Lattice strain Measurements, surface roughness determination and crystal growth studies indicate that contributions from magnetostrictive and magnetostatic contributions to the perpendicular anisotropy in these alloys are not significant. H RTEM and synchrotron-based x-ray diffraction experiments, on the other hand, confirm the existence of ordered CoPt3 at elevated temperatures. We suggest that the strong temperature dependence of the perpendicular anisotropy is correlated to the onset of spontaneous chemical ordering during the growth which results in anisotropie pair ordering. A tentative model explaining this strong temperature dependence is described.

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