FePt nanodot arrays with perpendicular easy axis, large coercivity, and extremely high density

Kim, Chaehyun; Loedding, Thomas; Jang, Seongjin; Zeng, Hao; Li, Zhen; Sui, Yucheng; Sellmyer, David J.

doi:doi:10.1063/1.2802038

Volume/Page
Keyword
DOI
Citation
Advanced

Volume: Page/Article:

Search Content Type

article doi:

Citation:

Significant reduction of coercivity without reduction of tunneling magnetoresistance ratio of CoFeB/MgO/CoFeB-based magnetic tunnel junction using sandwich-structured free layer

We report the significant reduction of coercivity (Hc) without huge drop of tunneling magnetoresistance ratio (TMR) in the CoFeB/MgO/CoFeB-based magnetic tunnel junction by employing sandwich-structured free layer of CoFeB/metallic spacer/NiFe. Strong magnetostatic coupling without physical contact induces magnetic softness from NiFe to CoFeB and avoids considerable reduction of TMR. This achievement satisfies the requirements given to the magnetic read head in hard disk drive and the spin torq...

Separation of the strain and finite size effect on the ferromagnetic properties of La_0.5Sr_0.5CoO₃ thin films

The ferromagnetic properties of epitaxial La0.5Sr0.5CoO3 thin films have been studied. The magnetic transition is affected by both strain and finite thickness. We have used a series of films of different thicknesses and on different substrates in order to quantitatively determine the change in Curie temperature contributed by each effect. The phase diagram of TC versus in-plane strain suggests that the ferromagnetic transition temperature is suppressed by tensile strain and enhanced by compress...

Ordered FePt nanodot arrays with extremely high density have been developed by physical vapor deposition using porous alumina templates as evaporation masks. Nanodot diameter of 18 nm and periodicity of 25 nm have been achieved, resulting in an areal density exceeding 1×10¹² dots/in.². Rapid thermal annealing converts the disordered fcc to L1₀ phase, resulting in (001)-oriented FePt nanodot arrays with perpendicular anisotropy and large coercivity, without the need of epitaxy. High anisotropy and coercivity, perpendicular easy axis orientation and extremely high density are desirable features for future magnetic data storage media applications.

RELATED DATABASES

To view database links for this article, you need to log in.

KEYWORDS and PACS

Keywords

annealing, coercive force, iron alloys, magnetic storage, nanostructured materials, nanotechnology, platinum alloys, vacuum deposition

PACS

81.16.-c

Methods of micro- and nanofabrication and processing
75.50.Vv

High coercivity materials
75.50.Tt

Fine-particle systems; nanocrystalline materials
61.46.-w

Structure of nanoscale materials
81.15.-z

Methods of deposition of films and coatings; film growth and epitaxy
85.70.Li

Other magnetic recording and storage devices (including tapes, disks, and drums)

ARTICLE DATA

Digital Object Identifier

http://dx.doi.org/10.1063/1.2802038

PUBLICATION DATA

ISSN

0003-6951 (print)

1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef

American Institute of Physics

For access to citing articles, you need to log in.

Figures (3)

Access to article objects (figures, tables, multimedia) requires a subscription; log in to view available files.
(Access to supplementary files, where available, is free for this journal.)