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(Color online) The magnetic phase diagram of states in reduced variables for layer thickness and interlayer exchange for and . Thick lines indicate the first-order transitions from the shifted ferrostripe phase (a) into the antiferrostripe (d) and the homogeneous (c) phases . These critical lines meet in a special critical point ( and ), where a continuous transition line ends on a first-order line (hollow circle). The thin solid line indicates the stability limit of the shifted ferrostripe phase. The dotted line indicates the second-order transition from the shifted stripes in antiferromagnetically coupled systems into the ferrostripes (b) with in ferromagnetically coupled or decoupled multilayers . At the dashed line , the antiferrostripe phase (d) continuously transforms into the homogeneous antiferromagnetic states (c) for . The dashed line for is the stability limit of the metastable antiferrostripe phase.
(Color online) The equilibrium values of the reduced shift and reduced period (inset) as functions of the reduced thickness for different values of in a two layer with . Hollow points indicate the solutions at the transition line , and solid points show the shift at the lability line .
(Color online) The calculated stray-field profiles for shifted ferrostripe modes for a multilayer with and . Inset: an isolated antiferromagnetic domain wall with “tiger-tail” distortion, the pattern is periodically repeated along the wall. Such patterns act as nucleation lines for ferrostripe modes.
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