Kerr rotation and perpendicular magnetic anisotropy of CoCr films with Al ultrathin interlayers and single‐layer CoCr films

The multilayer films [Al2O3/tCo Co/tPt Pt]N, produced by sequential deposition of Co and Pt on alumina consist in layers of CoPt alloyed nanoparticles. They show perpendicular magnetic anisotropy (PMA) below a freezing temperature Tf, an asperomagnetic-like phase below that temperature, and hard ferromagnetic ordering below a transition temperature T1 < Tf. A single layer granular film (N = 1) with deposition thicknesses tCo=0.7 nm, tPt=1.5 nm and particle diameter of 3 nm is presently studied. SQUID magnetometry shows that a single layer presents the three phases as well. Para-, aspero-and ferromagnetic phases are observed upon lowering the temperature, with transition temperatures Tf ≈ 375 K and T1 ≈ 200 K, respectively. In addition, the PMA persists, proving that there is no interlayer coupling in the multilayer system. SQUID results also reveal a core-shell structure in the CoPt nanoparticles.

Download Full-text

Perpendicular Magnetic Anisotropy and Magneto-Optical Properties of Sputtered Re-Tm(CoGd)/Pd Multilayered Films

MRS Proceedings ◽

10.1557/proc-458-369 ◽

1996 ◽

Vol 458 ◽

Author(s):

T. Yang ◽

W. H. Soe ◽

B. X. Liu ◽

R. Yamamoto

Keyword(s):

Magnetic Properties ◽

Magnetic Anisotropy ◽

Magnetic Layer ◽

Perpendicular Magnetic Anisotropy ◽

Film Plane ◽

Easy Magnetization Axis ◽

Easy Magnetization ◽

Kerr Rotation ◽

Multilayered Films ◽

Magnetization Axis

ABSTRACTThe magnetic properties of sputtered RE-TM(CoGd)/Pd multilayered films were studied. CoGd layers with high Gd concentration were amorphous. Reducing the Gd concentration, CoGd layers changed from amorphous to crystalline gradually. Like in the crystalline Co/Pd multilayered films, perpendicular magnetic anisotropy(PMA) was observed only for CoGd/Pd multilayered films with thin magnetic layer. It is interesting to note that critical magnetic layer thickness, below which the easy magnetization axis is perpendicular to the film plane, reaches 2.5nm for CoGd/Pd multilayered films with amorphous CoGd layers and is larger than that of Co/Pd multilayered films. Kerr rotation was found decreased with the adding of Gd.

Download Full-text

Interface-induced perpendicular magnetic anisotropy of Co nanoparticles on single-layer h-BN/Pt(111)

Applied Physics Letters ◽

10.1063/1.5010836 ◽

2018 ◽

Vol 112 (2) ◽

pp. 022407 ◽

Cited By ~ 2

Author(s):

Takahiro Watanabe ◽

Yoichi Yamada ◽

Akihiro Koide ◽

Shiro Entani ◽

Songtian Li ◽

...

Keyword(s):

Magnetic Anisotropy ◽

Single Layer ◽

Perpendicular Magnetic Anisotropy ◽

Co Nanoparticles

Download Full-text

Perpendicular magnetic anisotropy and magneto-optical Kerr rotation in FePt(001) monoatomic multilayers

Journal of Magnetism and Magnetic Materials ◽

10.1016/0304-8853(95)00192-1 ◽

1995 ◽

Vol 148 (1-2) ◽

pp. 163-164 ◽

Cited By ~ 69

Author(s):

S. Mitani ◽

K. Takanashi ◽

M. Sano ◽

H. Fujimori ◽

A. Osawa ◽

...

Keyword(s):

Magnetic Anisotropy ◽

Perpendicular Magnetic Anisotropy ◽

Kerr Rotation

Download Full-text

TEM Study of Co/Pd and Co/Au Multilayers

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100151015 ◽

1993 ◽

Vol 51 ◽

pp. 1036-1037

Author(s):

A.E.M. De Veirman ◽

F.J.G. Hakkens ◽

W.M.J. Coene ◽

F.J.A. den Broeder

Keyword(s):

Magnetic Anisotropy ◽

Ion Beam ◽

Perpendicular Magnetic Anisotropy ◽

Optical Recording ◽

Magnetic Multilayer ◽

Ion Beam Sputtering ◽

Cross Sectional ◽

Transmission Electron ◽

Beam Sputtering ◽

Substrate Temperatures

There is currently great interest in magnetic multilayer (ML) thin films (see e.g.), because they display some interesting magnetic properties. Co/Pd and Co/Au ML systems exhibit perpendicular magnetic anisotropy below certain Co layer thicknesses, which makes them candidates for applications in the field of magneto-optical recording. It has been found that the magnetic anisotropy of a particular system strongly depends on the preparation method (vapour deposition, sputtering, ion beam sputtering) as well as on the substrate, underlayer and deposition temperature. In order to get a better understanding of the correlation between microstructure and properties a thorough cross-sectional transmission electron microscopy (XTEM) study of vapour deposited Co/Pd and Co/Au (111) MLs was undertaken (for more detailed results see ref.).The Co/Pd films (with fixed Pd thickness of 2.2 nm) were deposited on mica substrates at substrate temperatures Ts of 20°C and 200°C, after prior deposition of a 100 nm Pd underlayer at 450°C.

Download Full-text