Magnetic order in two-dimensional arrays of nanometer-sized superparamagnets
Magnetic order in two-dimensional arrays of nanometer-sized superparamagnets
复制标题
DOI：
10.1103/physrevlett.76.1541
复制
发表时间：
1996-02-26
影响因子：
8.6
通讯作者：
Hembree, GG
中科院分区：
文献类型：
--
作者：
Scheinfein, MR;Schmidt, KE;Hembree, GG
随机二维岛组件在室温下具有作为岛半径a的函数的三个磁相。这些磁性状态是垂直磁化的随机反铁磁体（a < 1.5 nm）、面内超顺磁体（1.5 < a < 3 nm）和面内铁磁体（a > 3.0 nm）。平均场和蒙特卡罗方法被用来检查在二维有序-无序转变，并设置最小的无序耦合强度。
Random two-dimensional island assemblies have three magnetic phases at room temperature as a function of island radius a. These magnetic states are a perpendicularly magnetized random antiferromagnet (a < 1.5 nm), an in-plane superparamagnet (1.5 < a < 3 nm), and an in-plane ferromagnet (a > 3.0 nm) in a superferromagnetic regime. Mean-field and Monte Carlo methods are used to examine order-disorder transitions in two dimensions, and to set minimum interisland coupling strengths.