Observation and elimination of broken symmetry in L10 FePt nanostructures

被引：8

作者：

Quarterman, P. ^{[1
,2
]}

Wang, Hao ^{[1
,2
]}

Qiu, Jiao-Ming ^{[1
,2
]}

Guo, Honghua ^{[3
]}

Ma, Bin ^{[1
,2
]}

Liu, Xiaoqi ^{[1
,2
]}

Wang, Jian-Ping ^{[1
,2
]}

机构：

[1] Univ Minnesota, Dept Elect & Comp Engn, Minneapolis, MN 55455 USA

[2] Univ Minnesota, Ctr Micromagnet & Informat Technol MINT, Minneapolis, MN 55455 USA

[3] Fudan Univ, Dept Opt Sci & Engn, Shanghai 200433, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2015年 / 107卷 / 23期

关键词：

MAGNETIC-PROPERTIES; THIN-FILMS; SURFACE ANISOTROPY; NANOPARTICLES; NANOMAGNETS; ALLOY; PHASE;

D O I：

10.1063/1.4936933

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

An unexplained surface anisotropy effect was observed and confirmed in the magnetization reversal process of both L1(0) phase FePt nanoparticles with octahedral shape and (001) textured L10 FePt thin films with island nanostructures. We suggest that the nature of the observed surface effect is caused by broken symmetry on the FePt surface, which results in weakened exchange coupling for surface atoms. Furthermore, we propose, and experimentally demonstrate, a method to repair the broken symmetry by capping the FePt islands with a Pt layer, which could prove invaluable in understanding fundamental limitations of magnetic nanostructures. (C) 2015 AIP Publishing LLC.

引用

页数：4

共 37 条

[1] Colloquium:: Opportunities in nanomagnetism [J].

Bader, SD .

REVIEWS OF MODERN PHYSICS, 2006, 78 (01) :1-15

[2] Effect of Pt buffer layer on structural and magnetic properties of FePt thin films [J].

Chen, JS ;

Xu, YF ;

Wang, JP .

JOURNAL OF APPLIED PHYSICS, 2003, 93 (03) :1661-1665

[3] HIGH ANISOTROPY L1(0) THIN-FILMS FOR LONGITUDINAL RECORDING [J].

COFFEY, KR ;

PARKER, MA ;

HOWARD, JK .

IEEE TRANSACTIONS ON MAGNETICS, 1995, 31 (06) :2737-2739

[4] MAGNETOCRYSTALLINE ANISOTROPY AND ORBITAL MOMENTS IN TRANSITION-METAL COMPOUNDS [J].

DAALDEROP, GHO ;

KELLY, PJ ;

SCHUURMANS, MFH .

PHYSICAL REVIEW B, 1991, 44 (21) :12054-12057

[5] Size dependence, nucleation, and phase transformation of FePt nanoparticles [J].

Ding, Y ;

Majetich, SA .

APPLIED PHYSICS LETTERS, 2005, 87 (02)

[6] Surface contribution to the anisotropy of magnetic nanoparticles [J].

Garanin, DA ;

Kachkachi, H .

PHYSICAL REVIEW LETTERS, 2003, 90 (06) :4

[7] Fe oxidation versus Pt segregation in FePt nanoparticles and thin films [J].

Han, Luyang ;

Wiedwald, Ulf ;

Kuerbanjiang, Balati ;

Ziemann, Paul .

NANOTECHNOLOGY, 2009, 20 (28)

[8]

IVANOV OA, 1973, FIZ MET METALLOVED+, V35, P92

[9] Magnetic anisotropy of a single cobalt nanocluster [J].

Jamet, M ;

Wernsdorfer, W ;

Thirion, C ;

Mailly, D ;

Dupuis, V ;

Mélinon, P ;

Pérez, A .

PHYSICAL REVIEW LETTERS, 2001, 86 (20) :4676-4679

[10] Hysteretic properties of a magnetic particle with strong surface anisotropy [J].

Kachkachi, H ;

Dimian, M .

PHYSICAL REVIEW B, 2002, 66 (17) :1-11

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