Magnetic Frustration in Circular Arrays of Dipoles

Author

Seungha Yoon ; Youngman Jang ; Chunghee Nam ; Currivan, J.A. ; Cho, B.K. ; Ross, C.A.

Author_Institution

Dept. of Mater. Sci. & Eng., Massachusetts Inst. of Technol., Cambridge, MA, USA

Volume

3

fYear

2012

fDate

7/4/1905 12:00:00 AM

Firstpage

4000104

Lastpage

4000104

Abstract

Magnetostatically interacting structures consisting of 1.5 μm diameter rings of radially oriented nanomagnets were investigated using magnetic force microscopy. An even number of nanomagnets, 16 in this case, formed a ground state in which the magnetizations of neighboring nanomagnets were oriented antiparallel. However, an odd number of nanomagnets, 15, led to a frustrated state in which at least one pair of neighboring nanomagnets was magnetized parallel, giving a net radial magnetic charge. The “defect” in the structure was moved around the ring by a modest external field.

Keywords

frustration; ground states; magnetic force microscopy; magnetic moments; magnetic structure; magnetisation; nanomagnetics; circular arrays; defect; dipoles; frustrated state; ground state; magnetic force microscopy; magnetic frustration; magnetizations; magnetostatically interacting structures; net radial magnetic charge; radially oriented nanomagnets; size 1.5 mum; Ice; Magnetic resonance imaging; Magnetic switching; Magnetostatics; Saturation magnetization; Stationary state; Switches; Nanomagnetics; magnetic frustration; magnetostatic interactions;

fLanguage

English

Journal_Title

Magnetics Letters, IEEE

Publisher

ieee

ISSN

1949-307X

Type

jour

DOI

10.1109/LMAG.2011.2180704

Filename

6151244