Determination of the Upper Limit for the Cluster Moment Contributing the Giant Magneto Resistance in Laser Deposited Granular Cu-rich Thin Films

1996 ◽  
Vol 459 ◽  
Author(s):  
V. Madurga ◽  
R. J. Ortega ◽  
J. Vergara ◽  
K. V. Rao
Keyword(s):  
Thin Films ◽  
Laser Ablation ◽  
Cluster Size ◽  
Magnetic Hysteresis ◽  
Hysteresis Loops ◽  
Annealing Temperatures ◽  
Upper Limit ◽  
Magnetic Hysteresis Loops ◽  
Magneto Resistance

ABSTRACTWe have fabricated granular Cu95Co5 thin films by laser ablation-deposition. Within a regime of annealing temperatures, these samples exhibit Giant Magneto Resistance (GMR), typically 5% in 0.5 Tesla at 5 K. The magnetic hysteresis loops are found to show finite coercive fields in the whole temperature range 2 K - 300 K. Below 9 K, the field dependence of the MR shows a split maximum. We interpret the data in terms of coercivity arising from blocking phenomenon of single domain superparamagnetic Co clusters. A quantitative determination of the upper limit for the cluster moment contributing to GMR is estimated to be 17000 μB (a cluster size of 5 nm).

Influence of Annealing on the Surface Topography and Magnetic Properties of Thin Films of the FINEMET-Type Alloy

2015 ◽  
Vol 233-234 ◽  
pp. 699-704 ◽  
Author(s):  
Evgeniya Mikhalitsyna ◽  
Vasiliy Kataev ◽  
Pavel Geydt ◽  
Vladimir Lepalovsky ◽  
Erkki Lähderanta
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Scanning Probe Microscopy ◽  
Annealing Temperature ◽  
Magnetic Hysteresis ◽  
Hysteresis Loops ◽  
Scanning Probe ◽  
Type Alloy ◽  
Treatment Conditions ◽  
Magnetic Hysteresis Loops

Surface structure and magnetic properties of thin films of the FINEMET-type alloy modificated by Mo (FeCuNbSiBMo) were studied in the aim of establishing of their dependence on heat treatment conditions. The thicknesses of the films were varied from 10 to 800 nm. Dependence of the microstructure of the films surface on the annealing temperature was analyzed using scanning probe microscopy. Parameters of the topography features were estimated as a function of the films thickness and annealing temperature. Magnetic hysteresis loops were measured using vibrating sample magnetometer and discussed in the focus of surface and thickness influences.

scholarly journals Magnetically Anisotropic Ni2MnGa Thin Films: Coating Glass and Si Micro-Cantilevers Substrates

2009 ◽  
Vol 635 ◽  
pp. 161-166 ◽  
Author(s):  
Vicente Madurga ◽  
C. Favieres ◽  
J. Vergara
Keyword(s):  
Thin Films ◽  
Magnetic Hysteresis ◽  
Hysteresis Loops ◽  
Anisotropy Field ◽  
Inert Atmosphere ◽  
Glass Substrates ◽  
Incidence Plane ◽  
Easy Direction ◽  
Magnetic Hysteresis Loops ◽  
Deposition Processes

Ni2MnGa thin films, with thickness between 30 and 60 nm, were pulsed-laser deposited at room temperature on Si micro-cantilevers and glass substrates. Two different deposition processes were performed: normal deposition and off¬-normal. After annealing in an inert atmosphere, in-plane isotropic magnetic hysteresis loops were measured for the normal deposited films. In contrast, in-plane anisotropic hysteresis loops were obtained from the off-normal deposited ones. An in-plane easy direction for the magnetisation, perpendicular to the incidence plane of the plasma during deposition, was measured with an anisotropy field of ≈100 Oe and an easy coercive field of ≈24 Oe. The mechanical behaviour of the magnetically anisotropic coated micro-cantilevers and their response to a decreasing temperature permitted observing the martensitic transformation of the Ni2MnGa thin films.

scholarly journals Element-specific magnetic hysteresis loops observed in hexagonal ErFeO3 thin films

2021 ◽  
Author(s):  
Hiroko Yokota ◽  
Yu Kobori ◽  
Shunsuke Jitsukawa ◽  
Seiji Sakai ◽  
Yukiharu Takeda ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetic Hysteresis ◽  
Hysteresis Loops ◽  
Magnetic Hysteresis Loops

Simulations of magnetic hysteresis loops at high temperatures

2014 ◽  
Vol 116 (12) ◽  
pp. 123910 ◽  
Author(s):  
M. L. Plumer ◽  
J. van Ek ◽  
J. P. Whitehead ◽  
T. J. Fal ◽  
J. I. Mercer
Keyword(s):  
High Temperatures ◽  
Magnetic Hysteresis ◽  
Hysteresis Loops ◽  
Magnetic Hysteresis Loops

scholarly journals Iron-Doped Lithium Tantalate Thin Films Deposited by Magnetron Sputtering: A Study of the Iron Role in the Structure and the Derived Magnetic Properties

Crystals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 50 ◽  
Author(s):  
Sergio David Villalobos Mendoza ◽  
José Trinidad Holguín Momaca ◽  
José Trinidad Elizalde Galindo ◽  
Diana María Carrillo Flores ◽  
Sion Federico Olive Méndez ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetron Sputtering ◽  
Magnetic Hysteresis ◽  
Hysteresis Loops ◽  
Blocking Temperature ◽  
Ferromagnetic Behavior ◽  
Zero Field ◽  
Cooling Curves ◽  
X Ray Diffraction ◽  
Field Cooling

Fe-doped LiTaO3 thin films with a low and high Fe concentration (labeled as LTO:Fe-LC and LTO:Fe-HC, respectively) were deposited by magnetron sputtering from two home-made targets. The dopant directly influenced the crystalline structure of the LiTaO3 thin films, causing the contraction of the unit cell, which was related to the incorporation of Fe3+ ions into the LiTaO3 structure, which occupied Li positions. This substitution was corroborated by Raman spectroscopy, where the bands associated with Li-O bonds broadened in the spectra of the samples. Magnetic hysteresis loops, zero-field cooling curves, and field cooling curves were obtained in a vibrating sample magnetometer. The LTO:Fe-HC sample demonstrates superparamagnetic behavior with a blocking temperature of 100 K, mainly associated with the appearance of Fe clusters in the thin film. On the other hand, a room temperature ferromagnetic behavior was found in the LTO:Fe-LC layer where saturation magnetization (3.80 kAm−1) and magnetic coercivities were not temperature-dependent. Moreover, the crystallinity and morphology of the samples were evaluated by X-ray diffraction and scanning electron microscopy, respectively.

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