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Journal ArticleDOI

Magnetization Studies on Tb-Fe and Tb-Fe-Co Thin Films

01 Feb 2019-IEEE Transactions on Magnetics (IEEE)-Vol. 55, Iss: 2, pp 1-4
Abstract: Magnetization studies were carried out on Tb-Fe and Tb-Fe-Co thin films, prepared using magnetron co-sputtering technique. The films Tb 25 Fe 75 and Tb 31 Fe 69 were found to have perpendicular magnetic anisotropy (PMA) both at 25 and 300 K. In Tb-Fe-Co films, all the films were observed to exhibit planar anisotropy at 25 K, due to the increase of strain-induced anisotropy as a result of large magnetostriction at low temperatures leading to the development of in-plane anisotropy. PMA was observed in the films Tb 35 Fe 37 Co 28 , Tb 56 Fe 25 Co 19 , and Tb 63 Fe 20 Co 17 at 300 K. The Curie temperatures (T C ) of both TbxFe 100-x and Tb-Fe-Co films were found to be above room temperature (RT). Observing the Curie temperatures well above the RT, with the existence of PMA at RTs, is an interesting object in these films to find in magnetic data storage applications.
Topics: Magnetic anisotropy (55%), Curie temperature (54%), Magnetostriction (54%), Magnetization (52%)
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Book
01 Jan 1980-
Abstract: Preface. Contents of Volumes 1-4. 1. Quadrupolar interactions and magneto-elastic effects in rare-earth intermetallic compounds (P. Morin and D. Schmitt). 2. Magneto-optical spectroscopy of f-electron systems (W. Reim and J. Schoenes). 3. INVAR: Moment-volume instabilities in transition metals and alloys (E.F. Wasserman). 4. Strongly enhanced itinerant intermetallics and alloys (P.E. Brommer and J.J.M. Franse). 5. First-order magnetic processes (G. Asti). 6. Magnetic superconductors (O. Fischer). Author index. Subject index. Materials index.

239 citations


"Magnetization Studies on Tb-Fe and ..." refers background in this paper

  • ...The small hump observed close to 230 K in the out-of-plane configuration is due to the disordering of Tb moments [5]....

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Journal ArticleDOI
TL;DR: The creation and real-space observation of magnetic structures with well-defined topological properties and a lateral size as low as about 150 nm are reported, generated in a thin ferrimagnetic film by ultrashort single optical laser pulses.
Abstract: We report the creation and real-space observation of magnetic structures with well-defined topological properties and a lateral size as low as about 150 nm. They are generated in a thin ferrimagnetic film by ultrashort single optical laser pulses. Thanks to their topological properties, such structures can be classified as Skyrmions of a particular type that does not require an externally applied magnetic field for stabilization. Besides Skyrmions, we are able to generate magnetic features with topological characteristics that can be tuned by changing the laser fluence. The stability of such features is accounted for by an analytical model based on the interplay between the exchange and the magnetic dipole-dipole interactions. Skyrmions [1] are particlelike solutions of wave equations characterized by a topological index which is conserved in time and plays the important role of a quantum number for particle states in the corresponding field theory. One of the most interesting characteristics of such topological states of matter resides in the robustness that they hold with respect to perturbations and disorder. In magnetic materials, Skyrmions emerge as solitonlike excitations that cannot be traced back to the ground ferromagnetic state by continuous deformations of the local

238 citations


"Magnetization Studies on Tb-Fe and ..." refers background in this paper

  • ...Among all the R–T metal films, Tb–Fe and Tb–Fe–Co films are considered promising, due to a variety of magnetic studies and applications in memory devices [1]....

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Journal ArticleDOI
TL;DR: Using x-ray-absorption fine-structure measurements, clear evidence is obtained for structural anisotropy in amorphous sputter-deposited TbFe films exhibiting perpendicular magnetic an isotropy.
Abstract: Using x-ray-absorption fine-structure measurements we have obtained clear evidence for structural anisotropy in amorphous sputter-deposited TbFe films exhibiting perpendicular magnetic anisotropy. Modeling of the data shows that perpendicular anisotropy in these films is associated with Fe-Fe and Tb-Tb pair correlations which are greater in plane and Tb-Fe correlations which are greater perpendicular to the film plane. Upon annealing at 300 \ifmmode^\circ\else\textdegree\fi{}C the measured structural anisotropy disappears and the magnetic anisotropy decreases to a level consistent with magnetoelastic interactions between the film and substrate.

147 citations


"Magnetization Studies on Tb-Fe and ..." refers background in this paper

  • ...The EMD is seen to be in the plane of the film; it has been reported that the anisotropy of the Fe sublattice is planar in Fe-rich Tb–Fe films [7]....

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Journal ArticleDOI
Abstract: Evidence is presented from neutron diffraction measurements for the existence of an amorphous spin-polarization distribution in a sputtered rare-earth-iron alloy of composition 33 at% Tb, 67 at% Fe

94 citations


"Magnetization Studies on Tb-Fe and ..." refers background in this paper

  • ...The Fe/Co moments are dominant below the composition (xcomp) at which, the moments are compensated [14]....

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