Исследованы микропровода и микрополоски, полученные экстракцией из расплава PrDyFeCoB. Угловая зависимость магнитного момента микропроводов качественно изменяет вид в "сильном" магнитном поле, близком к полю насыщения намагниченности 4-5 kОе. Возникновение дополнительного максимума магнитного момента на угловой зависимости в сильных полях объяснено в рамках многодоменной модели Стоннера-Вольфарта (SW). В микрополосках разложение петли гистерезиса на две составляющие показывает, что коэрцитивная сила фазы alpha-FeСо (500-700 Oe) определяет ширину петли гистерезиса вблизи нулевого поля, в то время, как коэрцитивная сила фазы 2-14-1 (10 kOe) отвечает боковым петлям гистерезиса. Полосовые домены и их эволюция при намагничивании микрополосок выявлены с помощью магнито-оптической микроскопии Керра. Ключевые слова: микропровод, магнитная анизотропия, магнитомягкая фаза, домены.
In synthetic ferrimagnets with perpendicular anisotropy GdFeCo/Ir/GdFeCo, the dependence of the hysteresis loops of the anomalous Hall resistance and the characteristics of the loops on the angle between the magnetic field and the plane of the sample are analyzed. The part of the anomalous Hall resistance corresponding to the spin-orbit torque has been identified. The field dependences of the resistance are sensitive to switching between the magnetic states of the two-layer ferrimagnet and they reproduce the shapes of the magnetization hysteresis loops, calculated with the interlayer exchange interaction, crystal anisotropy, and Zeeman energies at different angles between the field and sample. A slow (~30 min) magnetic relaxation of resistivity hysteresis after reorientation of the sample in magnetic field was found. Specific domain dynamics inherent in two-layer samples was revealed by Kerr microscopy. It was found that slow restoration of the resistivity hysteresis loop is due to domain propagation.
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