Microstructural, Magnetic Anisotropy, and Magnetic Domain Structure Correlations in Epitaxial FePd Thin Films With Perpendicular Magnetic Anisotropy

Skuza, J. R.; Clavero, C.; Yang, Kai; Wincheski, Buzz; Lukaszew, R. A.

doi:10.1109/tmag.2009.2039923

Cited by 35 publications

(11 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[7] However, this feature appears only in alloys with L1 0 structure, epitaxial or polycrystalline with strong (001) texture. [8] The tetragonal L1 0 structure with the alternating planes of Fe and Pd atoms is the anisotropic crystal with strong magnetocrystalline anisotropy. The direction of magnetization normal to the film surface and perpendicular magnetic anisotropy appear only if the [001] crystallographic direction is perpendicular to the sample plane.…”

Section: Introductionmentioning

confidence: 99%

Determination of grain shape of laser-irradiated FePdCu thin alloy films

Perzanowski

Krupiński

Zarzycki

et al. 2014

Applied Surface Science

View full text Add to dashboard Cite

The irradiation with the 10 ns pulsed infrared Nd:YAG laser was applied to transform FePdCu multilayers into chemically ordered L1 0 phase. The X-ray diffraction methods (Θ/2Θ scan, ψ-scan, ω-scan) were used to trace the presence of L1 0 phase after laser annealing with different number of pulses. The size and shape of crystallites was determined depending on their orientation with respect to film plane. The (111) oriented crystallites of constituent metals were built as coherent domains spreading through multilayers during deposition of films. Laser annealing induced the transformation of multilayers to alloy, and the ordering of (111) oriented crystallites. Simultaneously, the (002) oriented crystallites appeared confirming the transformation to L1 0 alloy.

show abstract

Section: Introductionmentioning

confidence: 99%

Determination of grain shape of laser-irradiated FePdCu thin alloy films

Perzanowski

Krupiński

Zarzycki

et al. 2014

Applied Surface Science

View full text Add to dashboard Cite

show abstract

“…In all cases the values of the order parameter are smaller than for the FePd alloys deposited on MgO at the elevated temperature by molecular beam epitaxy. [43][44][45] However, they are comparable and even greater than the S values for the FePd alloys deposited on MgO at room temperature [46] which were equal to 0.58. It is in agreement with results of [47] which show that the tensile stress present in polycrystalline multilayers is more important to obtain high degree of the long range order in FePd alloy.…”

Section: Structurementioning

confidence: 99%

Ordered FePdCu nanoisland arrays made by templated solid-state dewetting

Krupiński¹,

Perzanowski²,

Zarzycki³

et al. 2015

Nanotechnology

View full text Add to dashboard Cite

Ordered FePdCu nanoisland arrays were formed by annealing at 600 °C, which caused solid state dewetting of [Cu/Fe/Pd] multilayers deposited on self-assembled SiO2 nanospheres with a size of 100 nm. A single FePdCu island was formed on the top of each SiO2 nanosphere. The structure of the obtained system was studied by x-ray diffraction (XRD), while its magnetic properties were studied by SQUID magnetometry. A partially ordered L10 alloy appeared in the annealed films, leading to magnetic hardening of the material. The paper presents the influence of the patterning on the system properties. It is shown that templated dewetting is a method providing nanoislands with well-controlled sizes and positions. The role of copper admixture in controlling the structural and magnetic properties is also discussed.

show abstract

“…In the present paper, the notations of plane and direction based on face-centered cubic (fcc) structure In order to investigate the mechanism of thin film growth, it is useful to employ an epitaxial film, since the crystallographic orientation can be controlled by that of single-crystal substrate. FePt , CoPt [61][62][63][64][65][66][67][68][69][70][71][72][73] , and FePd [58][59][60][64][65][66][67][74][75][76][77][78][79] epitaxial films have been prepared on (001) substrates of MgO, SrTiO3, etc. The c-axis orientation has been investigated by high-resolution transmission electron microscopy 30,48) , selected area electron diffraction 49) , in-plane 19,[64][65][66][67] and pole-figure 50) X-ray diffractions (XRDs), and reflection high-energy electron diffraction (RHEED) [64][65][66][67] .…”

Section: Introductionmentioning

confidence: 99%

Alignment of c-Axis Orientation Perpendicular to the Substrate Surface in FePt Alloy Thin Film with L10 Structure

et al. 2015

View full text Add to dashboard Cite

An FePt alloy thin film with L10 structure formed on a (001)-oriented polycrystalline underlayer or on a (001)-oriented single-crystal substrate may involve (100) variant with the c-axis lying in the film plane in addition to (001) variant with the c-axis normal to the substrate surface. In the present study, FePt(2-40 nm) films with and without MgO(2 nm) cap layers are prepared on MgO(001) single-crystal substrates by employing a two-step formation method consisting of low-temperature deposition followed by high-temperature annealing. Disordered FePt(001) single-crystal films with and without MgO(001) single-crystal cap layers epitaxially grow on the substrates at 200 °C. For the films thinner than 10 nm, the in-plane and out-of-plane lattices are respectively expanded and shrunk due to accommodation of the lattice misfit of film with respect to the substrate. With increasing the thickness up to 40 nm, the strain is relaxed. The phase transformation from A1 to L10 occurs when the films are annealed at 600 °C. The cap layer seems to prevent the strain release and to promote the phase transformation along the perpendicular direction. The c-axis orientation is controlled to be perpendicular by using the two-step method for the FePt films of thicknesses less than 10 nm with MgO cap layers. On the contrary, the film of 40 nm thickness with cap layer and the films of 2-40 nm thicknesses without cap layers involve small volumes of L10(100) variant. The order degrees of films with cap layers are higher than those of films without cap layers. The films with cap layers have flat surfaces with the arithmetical mean roughness values lower than 0.3 nm for all the investigated thicknesses, whereas an island-like surface is formed for the 2-nm-thick film without cap layer. The film consisting of only L10(001) variant shows a strong perpendicular magnetic anisotropy and a very low in-plane coercivity. Introduction of MgO cap layer is useful in aligning the c-axis perpendicular to the substrate surface, enhancing the L10 ordering, forming a flat surface, and achieving a strong perpendicular magnetic anisotropy.

show abstract

Microstructural, Magnetic Anisotropy, and Magnetic Domain Structure Correlations in Epitaxial FePd Thin Films With Perpendicular Magnetic Anisotropy

Cited by 35 publications

References 20 publications

Determination of grain shape of laser-irradiated FePdCu thin alloy films

Determination of grain shape of laser-irradiated FePdCu thin alloy films

Ordered FePdCu nanoisland arrays made by templated solid-state dewetting

Alignment of <i>c</i>-Axis Orientation Perpendicular to the Substrate Surface in FePt Alloy Thin Film with <i>L</i>1<sub>0</sub> Structure

Contact Info

Product

Resources

About