Lattice Distortions and Domain Structure in Epitaxial Manganite Thin Films

1999 ◽  
Vol 602 ◽  
Author(s):  
Y. Suzuki ◽  
Yan Wu ◽  
U. Rüdiger ◽  
J. Yu ◽  
A.D. Kent ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Hydrostatic Pressure ◽  
Magnetic Anisotropy ◽  
Domain Structure ◽  
Colossal Magnetoresistance ◽  
Lattice Mismatch ◽  
Magnetic Domain ◽  
Lattice Distortions

AbstractLattice distortions, be they in the form of chemical and hydrostatic pressure in bulk or lattice mismatch between film and substrate, have significant effects on the transport as well as the magnetic properties of colossal magnetoresistance (CMR) materials. We summarize here our results on tensilely and compressively strained La0.7Sr0.3MnO3 (LSMO) thin films that indicate the important role of lattice distortions due to the lattice mismatch between the film and substrate. The strain due to lattice distortions can be used to tune the magnetic domain structure, magnetization, magnetic anisotropy and magnetotransport of LSMO thin films.

Magnetic Domain Structures in CoNiFe Thin Films and Lines

2002 ◽  
Vol 738 ◽  
Author(s):  
Lucas Pérez ◽  
Oscar de Abril ◽  
Claudio Aroca ◽  
Pedro Sánchez ◽  
Eloísa López ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Thin Film ◽  
Thin Films ◽  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Domain Structure ◽  
Magnetic Domain ◽  
Electrodeposition Process ◽  
Domain Structures

ABSTRACTThin films and arrays of lines of magnetic CoNiFe alloy have been produced by electrodeposition. A magnetic field was applied during the electrodeposition process in order to induce a magnetic anisotropy in the sample. The dependence of the magnetic properties and the magnetic domain structures on the thickness of the films is reported. In addition to this, the magnetic properties and the domain structure of a thin film and an array of lines, with the same thickness and deposited in the same conditions, have been compared. An increase in the coercivity of the array of lines has been shown.

Chemical disorder effects in transport and magnetic properties of perovskite manganite

2005 ◽  
Vol 20 (4) ◽  
pp. 813-817
Author(s):  
Subhayan Biswas ◽  
Sandip Chatterjee ◽  
P. Chatterjee ◽  
A.K. Nigam ◽  
S.K. De
Keyword(s):  
Magnetic Properties ◽  
Colossal Magnetoresistance ◽  
Lattice Mismatch ◽  
Perovskite Manganite ◽  
The Novel ◽  
Ionic Radii ◽  
Three Samples ◽  
Moderate Magnetic Field ◽  
A Site

The dependence of the novel properties observed in colossal magnetoresistance (CMR) materials, other than average ionic radii 〈rA〉 and Mn valence ratio (Mn3+/Mn4+), was investigated through examination of the transport and magnetic properties of Pr0.65(Ca0.7Sr0.3)0.35MnO3, La0.123Pr0.527(Ca0.8Sr0.2)0.35MnO3, and Pr0.65(Ca0.866Ba0.134)0.35MnO3. The average ionic radii 〈rA〉 and valence ratio of all three samples have been kept equal. The results of this investigation indicate a more intense role of the nature of individual A-site cation and the lattice mismatch. A remarkably large magnetoresistance of the order of 108 at moderate magnetic field has been observed for Ba-doped sample.

scholarly journals Thickness Dependent Surface Topography, Magnetic Properties and Magnetic Domain Structure of Amorphous FeTaC Thin Films

2018 ◽  
Vol 07 (03) ◽  
Author(s):  
Camelia Das ◽  
Jumal Das ◽  
Thiruvengadam Vijayabaskaran ◽  
Subhankar Bedanta ◽  
Abhishek Talapatra ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Surface Topography ◽  
Domain Structure ◽  
Magnetic Domain ◽  
Magnetic Domain Structure

Magnetic domain structure of colossal magnetoresistance thin films and islands

2004 ◽  
Vol 95 (11) ◽  
pp. 7354-7356 ◽  
Author(s):  
Trevor W. Olson ◽  
Jeanine M. W. Olson ◽  
Andreas Scholl ◽  
Y. Suzuki
Keyword(s):  
Thin Films ◽  
Domain Structure ◽  
Colossal Magnetoresistance ◽  
Magnetic Domain ◽  
Magnetic Domain Structure

Magnetism of Cobalt Base Artificial Lattice Films

2001 ◽  
Vol 674 ◽  
Author(s):  
Masataka Masuda ◽  
Shun Matsumoto ◽  
Kunihiko Taka ◽  
Naoki Yoshitake ◽  
Yasunori Hayashi
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Layer Thickness ◽  
Lattice Mismatch ◽  
Magnetic Domain ◽  
Perpendicular Magnetic Anisotropy ◽  
Domain Size ◽  
Perpendicular Anisotropy ◽  
Nonmagnetic Metal ◽  
Hydrogen Implantation

ABSTRACTThe Co/Pd and Co/Pd artificial lattice films have attracted much interest by their special magnetization properties. We discussed the effect of the Pt, Pd layer thickness on the magnetic anisotropy, and we showed the effect of the hydrogen ion implantation on the magnetic properties of multi-layered films. The Co/Pt and Co/Pd multi-layered films were formed on Si(111) substrates with molecular beam epitaxy. We did structure analysis, magnetic domain analysis and magnetic properties evaluation with XRD, MFM and VSM, respectively. Among the series of films of 0.4nm Co layer, XRD showed that the film of 1.0nm Pt layer had a highest periodicity and that they had (111) plane orientation completely. The magnetic domain size reduced with the increase of the thickness of Pt layer. We found out that the coercivity decreased linearly as a function of the length of magnetic domain wall in the unit area. The result of VSM showed that the multi-layered films of Pt thickness of less than 2.8nm had perpendicular magnetic anisotropy. The perpendicular anisotropy energy changed by the nonmagnetic layer thickness and had a maximum value for 0.4nm Co 0.4nm/ nonmagnetic metal 1.0nm multi-layered film. After hydrogen implantation into the films, XRD showed that the lattice spacing was swelled with hydrogen dose. Also, MFM observed that the magnetic domain size reduced with the increase of the hydrogen dose. The easy axis of magnetization changed from perpendicular to parallel in the plane with the increase of the hydrogen dose. After evacuation of hydrogen at 473K, perpendicular anisotropy was partially recovered. This phenomenon suggested that the origin of magnetic anisotropy was mainly the lattice mismatch and distortion in the layer interface. But Co/Pd film was not recovered by this thermal treatment. This means that Pd made stable hydride and did not evacuate hydrogen at this temperature.

Domains and domain nucleation in magnetron-sputtered CoCr thin films

1993 ◽  
Vol 51 ◽  
pp. 1046-1047
Author(s):  
B. G. Demczyk
Keyword(s):  
Thin Films ◽  
Domain Structure ◽  
Magnetic Domain ◽  
Domain Size ◽  
Film Plane ◽  
Magnetic Domain Structure ◽  
Perpendicular Magnetization ◽  
Columnar Grains ◽  
Reversal Mechanism ◽  
Lorentz Transmission Electron Microscopy

CoCr thin films have been of interest for a number of years due to their strong perpendicular anisotropy, favoring magnetization normal to the film plane. The microstructure and magnetic properties of CoCr films prepared by both rf and magnetron sputtering have been examined in detail. By comparison, however, relatively few systematic studies of the magnetic domain structure and its relation to the observed film microstructure have been reported. In addition, questions still remain as to the operative magnetization reversal mechanism in different film thickness regimes. In this work, the magnetic domain structure in magnetron sputtered Co-22 at.%Cr thin films of known microstructure were examined by Lorentz transmission electron microscopy. Additionally, domain nucleation studies were undertaken via in-situ heating experiments.It was found that the 50 nm thick films, which are comprised of columnar grains, display a “dot” type domain configuration (Figure 1d), characteristic of a perpendicular magnetization. The domain size was found to be on the order of a few structural columns in diameter.

Effect of tensile stress on the magnetic domain structure of Fe and NiFe thin films

1978 ◽  
Vol 49 (3) ◽  
pp. 2007-2009 ◽  
Author(s):  
T. P. Darby ◽  
K. L. Parker ◽  
H. C. Tong
Keyword(s):  
Thin Films ◽  
Tensile Stress ◽  
Domain Structure ◽  
Magnetic Domain ◽  
Magnetic Domain Structure

Effect of Thickness on Mechanically Tunable Magnetic Anisotropy of FeGa Thin Films Deposited on Flexible Substrates

2015 ◽  
Vol 815 ◽  
pp. 227-232 ◽  
Author(s):  
Ying Yu ◽  
Shu Hong Xie ◽  
Qing Feng Zhan
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Effective Strain ◽  
Anisotropy Field ◽  
Saturation Field ◽  
Effective Anisotropy ◽  
Magnetostriction Constant ◽  
The Difference ◽  
Different Strains

A practical way to manipulate the magnetic anisotropy of magnetostrictive FeGa thin films grown on flexible polyethylene terephthalate (PET) substrates is introduced in this study. The effect of film thickness on magnetic properties and magnetostriction constant of polycrystalline FeGa thin films was investigated. The anisotropy field Hk of flexible FeGa films, i.e., the saturation field determined by fitting the hysteresis curves measured along the hard axis, was enhanced with increasing the tensile strain applied along the easy axis of the thin films, but this enhancement via strain became unconspicuous with increasing the thickness of FeGa films. In order to study the magnetic sensitivity of thin films responding to the external stress, we applied different strains on these films and measure the corresponding anisotropy field. Moreover, the effective magnetostriction constant of FeGa films was calculated from the changes of both anisotropy field and external strain based on the Villari effect. A Neel’s phenomenological model was developed to illustrate that the effective anisotropy field of FeGa thin films was contributed from both the constant volume term and the inverse thickness dependent surface term. Therefore, the magnetic properties for the volume and surface of FeGa thin films were different, which has been verified in this work by using vibrating sample magnetometer (VSM) and magneto-optic Kerr effect (MOKE) system. The anisotropy field contributed by the surface of FeGa film and obtained by MOKE is smaller than that contributed by the film volume and measured by VSM. We ascribed the difference in Hk to the relaxation of the effective strain applied on the films with increasing the thickness of films.

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