Effects of Ta seed layer and annealing on magnetoresistance in CoFe∕Pd-based pseudo-spin-valves with perpendicular anisotropy

Law, Randall; Sbiaa, R.; Liew, T.; Chong, Tow Chong

doi:10.1063/1.2824832

Cited by 62 publications

(29 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1(a)). The thin amorphous Ta seed layer allows for greater mobility of the deposited atoms and an improved fcc-(111) orientation of the Pd layer deposited upon it, thus improving the perpendicular anisotropy of the [Co/Pd] multilayers 16,27 . Samples were characterized by vibrating sample magnetometry (VSM), magnetic force microscopy (MFM) and ferromagnetic resonance spectroscopy (FMR).…”

Section: Experimental Methodsmentioning

confidence: 99%

Magnetic structure and anisotropy of[Co/Pd]5/NiFemultilayers

et al. 2015

View full text Add to dashboard Cite

The magnetization behavior, magnetic anisotropy and domain congurations of Co/Pd multilayers with perpendicular magnetic anisotropy capped with permalloy is investigated using magnetometry, magnetic force microscopy and ferromagnetic resonance. The thickness of the Ni80Fe20 layer in [Co/Pd]5/NiFe(t) was varied from t = 0 nm to 80 nm in order to study the interplay between the anisotropy and magnetization directions of the Co/Pd and the NiFe. By varying the thickness of the NiFe layer the net anisotropy changes sign, but domains with plane-normal magnetization are present even for the thickest NiFe. Ferromagnetic resonance measurements show a decrease in damping with increasing NiFe thickness. The results demonstrate how the magnetic behavior of mixed-anisotropy thin films can be controlled.

show abstract

Section: Experimental Methodsmentioning

confidence: 99%

Magnetic structure and anisotropy of[Co/Pd]5/NiFemultilayers

et al. 2015

View full text Add to dashboard Cite

show abstract

“…7 Especially, the effect of a Ta seed layer on various thin ferromagnetic films has been studied. [8][9][10] However, Ta and Co thin films have not been reported to the best of our knowledge. Understanding the growth, microstructure, and the effect of a buffer layer on the structure and magnetic properties of Co thin films will contribute to the field of thin film magnetism.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ta buffer layer and thickness on the structural and magnetic properties of Co thin films

Vahaplar¹,

Tari²,

Tokuc³

et al. 2009

Journal of Vacuum Science &Amp; Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena

View full text Add to dashboard Cite

Single Co and Ta/Co bilayers were grown on Si͑100͒ substrates in a magnetron sputtering system. The effect of Ta buffer layer and the thickness of Co layer on the structural and magnetic properties of the Co layers has been studied. A single Co layer shows a textured structure above thickness of 40 nm according to the x-ray diffraction ͑XRD͒ pattern. The magnetic properties of Co layers depend significantly on the thickness of the films. Ta grows as highly textured ␤-Ta ͑tetragonal͒ phase on Si with a smooth surface. The XRD and atomic force microscopy results show that the Ta buffer layer improves the structural properties dramatically, resulting in a strongly textured and smoother surface morphology. The Ta layer also affects the magnetic properties of Co layers to a large extent, especially inducing an in-plane anisotropy in thin Co films.

show abstract

“…Magnetic multilayered nano-films and superlattices which include nonmagnetic palladium layers are of very large interest for the magnetic community because of their importance for new concepts of high-density magnetic random access memory utilizing nanoscale magnetic tunnel junctions [11]. This interest stems from the strong perpendicular magnetic anisotropy (PMA) demonstrated for Co/Pd [11][12] and CoFe/Pd [13] multilayers on which these concepts rely on. Palladium [14] and similar hydrogen-sensitive niobium nonmagnetic metallic spacers [15] have also been used in magnetic spin valve nanostructures which are important to numerous spintronic applications, including applications in reading heads for modern hard drives.…”

mentioning

confidence: 99%

“…As mentioned above, there is strong evidence that the effect is of interfacial nature. A typical magnetic interfacial effect is perpendicular anisotropy induced in a number of FM/NM multilayers [11][12][13]. Co/Pd is a typical material with perpendicular magnetization [11][12]; where uniaxial anisotropy at the interface of the two layers is strong enough to force the magnetization vector out of plane, provided the film is sufficiently thin.…”

mentioning

confidence: 99%

Metallic spintronic thin film as a hydrogen sensor

Chang

Kostylev

Ivanov

2013

Applied Physics Letters

View full text Add to dashboard Cite

We investigate the response of palladium-cobalt bi-layer thin films to hydrogen charging at atmospheric pressure for spintronic applications. We find that hydrogen absorption by the palladium layer results in the narrowing and shifting of the ferromagnetic resonance line for the material. We explain the observed phenomena as originating from reduction in spin pumping effect and from variation in the magnetic anisotropy of the cobalt film through an interface effect. The shift of the resonance frequency or field is the easiest to detect. We utilize it to demonstrate functionality of the bi-layer films as a hydrogen sensor.Recently, the demand for highly stable and sensitive hydrogen gas sensors has increased due to growing importance of fuel cell applications. Various types of hydrogen gas sensors have been proposed [1]. All the proposed sensors have a number of drawbacks. In particular, sensors either based on variation of resistance of semiconductors [2], or on catalytic oxidation of noble metals * Corresponding author.

show abstract

Effects of Ta seed layer and annealing on magnetoresistance in CoFe∕Pd-based pseudo-spin-valves with perpendicular anisotropy

Cited by 62 publications

References 18 publications

Magnetic structure and anisotropy of[Co/Pd]5/NiFemultilayers

Magnetic structure and anisotropy of[Co/Pd]5/NiFemultilayers

Effect of Ta buffer layer and thickness on the structural and magnetic properties of Co thin films

Metallic spintronic thin film as a hydrogen sensor

Contact Info

Product

Resources

About