Title :
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
fDate :
7/4/1905 12:00:00 AM
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;
Journal_Title :
Magnetics Letters, IEEE
DOI :
10.1109/LMAG.2011.2180704
