Different mechanisms of spin reorientation in exchange coupled double rare earth-transition metal layers with in-plane and perpendicular magnetic anisotropy

2000 ◽  
Vol 87 (9) ◽  
pp. 6893-6895 ◽  
Author(s):  
Evangelos Stavrou ◽  
Rachid Sbiaa ◽  
Takao Suzuki ◽  
Klaus Roell
Keyword(s):  
Rare Earth ◽  
Transition Metal ◽  
Magnetic Anisotropy ◽  
Perpendicular Magnetic Anisotropy ◽  
Spin Reorientation ◽  
Metal Layers

Magneto-Optical Storage Materials

MRS Bulletin ◽  
1990 ◽  
Vol 15 (4) ◽  
pp. 31-39 ◽  
Author(s):  
Frans J.A.M. Greidanus ◽  
W. Bas Zeper
Keyword(s):  
Rare Earth ◽  
Transition Metal ◽  
Magnetic Anisotropy ◽  
Perpendicular Magnetic Anisotropy ◽  
Optical Storage ◽  
Optical Recording ◽  
Good Oxidation Resistance ◽  
Recording Material ◽  
High Storage ◽  
Very High

Magneto-optical (MO) recording combines the advantages of optical recording and magnetic recording. It offers very high storage densities, it is a noncontact technique, and it allows an unlimited number of read/write cycles. Although the potential of magneto-optical recording was recognized nearly 25 years ago, suitable materials did not exist at that time. Since then, substantial efforts have been made optimizing existing materials and searching for new ones. In 1973 an important development was started by Chaudhari et al., who discovered amorphous GdCo with perpendicular magnetic anisotropy as a possible MO recording material. Today amorphous ternary rare-earth (RE) transition-metal (TM) alloys like GdTbFe and TbFeCo are the recording layers in the MO disks which appear on the market. Although these materials show good recording performance, they also exhibit some drawbacks, mainly caused by their susceptibility to oxidarion and corrosion. However, two new classes of suitable MO materials with good oxidation resistance are emerging.

scholarly journals Origin of perpendicular magnetic anisotropy in amorphous thin films

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Daniel Lordan ◽  
Guannan Wei ◽  
Paul McCloskey ◽  
Cian O’Mathuna ◽  
Ansar Masood
Keyword(s):  
Thin Films ◽  
Magnetic Anisotropy ◽  
Perpendicular Magnetic Anisotropy ◽  
Functional Materials ◽  
Spin Reorientation ◽  
Amorphous Films ◽  
Amorphous Thin Films ◽  
Magnetic Performance ◽  
Out Of Plane ◽  
Sputtering Pressure

AbstractThe emergence of perpendicular magnetic anisotropy (PMA) in amorphous thin films, which eventually transforms the magnetic spins form an in-plane to the out-of-plane configuration, also known as a spin-reorientation transition (SRT), is a fundamental roadblock to attain the high flux concentration advantage of these functional materials for broadband applications. The present work is focused on unfolding the origin of PMA in amorphous thin films deposited by magnetron sputtering. The amorphous films were deposited under a broad range of sputtering pressure (1.6–6.2 mTorr), and its effect on the thin film growth mechanisms was correlated to the static global magnetic behaviours, magnetic domain structure, and dynamic magnetic performance. The films deposited under low-pressure revealed a dominant in-plane uniaxial anisotropy along with an emerging, however feeble, perpendicular component, which eventually evolved as a dominant PMA when deposited under high-pressure sputtering. This change in the nature of anisotropy redefined the orientation of spins from in-plane to out-of-plane. The SRT in amorphous films was attributed to the dramatic change in the growth mechanism of disorder atomic structure from a homogeneously dispersed to a porous columnar microstructure. We suggest the origin of PMA is associated with the columnar growth of the amorphous films, which can be eluded by a careful selection of a deposition pressure regime to avoid its detrimental effect on the soft magnetic performance. To the author’s best knowledge, no such report links the sputtering pressure as a governing mechanism of perpendicular magnetisation in technologically important amorphous thin films.

Perpendicular magnetic anisotropy and magneto‐optical properties of evaporated (Fe,Co)–rare‐earth amorphous binary alloy films

1988 ◽  
Vol 64 (10) ◽  
pp. 5492-5494 ◽  
Author(s):  
A. Yoshihara ◽  
M. Takahashi ◽  
T. Shimamori ◽  
T. Wakiyama ◽  
M. Miyazaki ◽  
...  
Keyword(s):  
Optical Properties ◽  
Rare Earth ◽  
Magnetic Anisotropy ◽  
Binary Alloy ◽  
Perpendicular Magnetic Anisotropy ◽  
Alloy Films ◽  
Amorphous Binary Alloy
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