Orbital magnetic moments of Co in multilayers with perpendicular magnetic anisotropy

Abstract Mn-based alloys exhibit unique properties in the spintronics materials possessing perpendicular magnetic anisotropy (PMA) beyond the Fe and Co-based alloys. It is desired to figure out the quantum physics of PMA inherent to Mn-based alloys, which have never been reported. Here, the origin of PMA in ferrimagnetic Mn3− δ Ga ordered alloys is investigated to resolve antiparallel-coupled Mn sites using x-ray magnetic circular and linear dichroism (XMCD/XMLD) and a first-principles calculation. We found that the contribution of orbital magnetic moments in PMA is small from XMCD and that the finite quadrupole-like orbital distortion through spin-flipped electron hopping is dominant from XMLD and theoretical calculations. These findings suggest that the spin-flipped orbital quadrupole formations originate from the PMA in Mn3− δ Ga and bring the paradigm shift in the researches of PMA materials using x-ray magnetic spectroscopies.

Download Full-text

Perpendicular magnetic anisotropy of Tb magnetic moments in Tb/Fe multilayers

Journal of Magnetism and Magnetic Materials ◽

10.1016/s0304-8853(96)00571-9 ◽

1997 ◽

Vol 165 (1-3) ◽

pp. 408-410

Author(s):

M. Trhlík ◽

P. De Moor ◽

K. Mibu ◽

N. Severijns ◽

T. Shinjo ◽

...

Keyword(s):

Magnetic Anisotropy ◽

Magnetic Moments ◽

Perpendicular Magnetic Anisotropy

Download Full-text

Investigation and Effective Control of Perpendicular Magnetic Anisotropy for TbCo Films with Different Underlayers

SPIN ◽

10.1142/s2010324716500090 ◽

2016 ◽

Vol 06 (03) ◽

pp. 1650009 ◽

Cited By ~ 2

Author(s):

Minghong Tang ◽

Shaohai Chen ◽

Xiangli Zhang ◽

Zongzhi Zhang ◽

Q. Y. Jin

Keyword(s):

Magnetic Properties ◽

Magnetic Anisotropy ◽

Saturation Magnetization ◽

Magnetic Moments ◽

Perpendicular Magnetic Anisotropy ◽

Effective Control ◽

Experimental Measurements ◽

Alloy Films ◽

Micromagnetic Simulations

We performed a detailed study on the perpendicular magnetic anisotropy (PMA) of TbCo film by using two kinds of nonmagnetic underlayers, Ta and Ta/Cu with different thicknesses. We found that for both the Tb-rich and Co-rich TbCo alloy films, the PMA strength decreases considerably with the increase of Ta underlayer thickness, while their net saturation magnetization [Formula: see text] exhibit opposite varying trends. The [Formula: see text] value continues to increase for the Co-rich TbCo samples while decrease for the Tb-rich films. Interestingly, an additional Cu layer inserted between the Ta and TbCo layers can efficiently recover the PMA and [Formula: see text]. We attribute such observed variation behaviors of magnetic properties to the increased disordering of Tb magnetic moments at the Ta/TbCo interface, which has been verified by both experimental measurements and micromagnetic simulations.

Download Full-text

Magnetic anisotropic properties of Pd/Co/Pd trilayer films studied by X-ray absorption spectroscopy and magnetic circular dichroism

RSC Advances ◽

10.1039/c4ra15683h ◽

2015 ◽

Vol 5 (25) ◽

pp. 19014-19019 ◽

Cited By ~ 7

Author(s):

K. Saravanan ◽

C.-H. Kao ◽

Y.-C. Shao ◽

Y.-F. Wang ◽

B.-Y. Wang ◽

...

Keyword(s):

Magnetic Anisotropy ◽

Electronic Structures ◽

Magnetic Circular Dichroism ◽

Magnetic Moments ◽

Perpendicular Magnetic Anisotropy ◽

Effect Of Temperature ◽

Alloy Formation ◽

X Ray ◽

The Relationship ◽

X Ray Absorption

Strong perpendicular magnetic anisotropy (PMA) is observed in annealed Pd/Co/Pd trilayer film. The effect of temperature on alloy formation, the relationship among the atomic/electronic structures, magnetic moments and PMA has been studied.

Download Full-text

Enhanced orbital magnetic moments in magnetic heterostructures with interface perpendicular magnetic anisotropy

Scientific Reports ◽

10.1038/srep14858 ◽

2015 ◽

Vol 5 (1) ◽

Cited By ~ 21

Author(s):

Tetsuro Ueno ◽

Jaivardhan Sinha ◽

Nobuhito Inami ◽

Yasuo Takeichi ◽

Seiji Mitani ◽

...

Keyword(s):

Magnetic Anisotropy ◽

Magnetic Moments ◽

Perpendicular Magnetic Anisotropy ◽

Magnetic Heterostructures

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