Магнитные свойства и локальные состояния ионов Fe в магнитных сверхрешетках на основе Fe/Co/Mo (стр. 12 )

4. Для образцов [Fe(10Å)Co(xÅ)Mo(12Å)]x100; x=(4-36) и [Fe(xÅ)Co(21Å)Mo(12Å)]x100; x=(4-24) также обнаружено наличие немонотонных зависимостей осцилляционного характера спонтанной и остаточной намагниченности от толщины слоёв Co и Fe с периодом порядка 6Å. Это может быть обусловлено существованием интерференционных эффектов электронных волн в интерфейсах, которые приводят к образованию квантовых ям.

5. Обнаружены большие величины спонтанной намагниченности Iso>1710Гс в некоторых МСР на основе Fe/Co/Mo, которые могут быть обусловлены: а) изменением плотности состояний на уровне Ферми для атомов Fe и Со на поверхностях кластеров и интерфейсов, б) размораживанием орбитальных моментов Fe и Со в кластерах и на поверхностях интерфейсов. в) Вклад в суммарную намагниченность могут вносить также магнитные моменты ионов Mo, для которых в силу большого спин-орбитального расщепления частично снимается орбитальное вырождение. По теоретическим оценкам, магнитный момент свободных ионов Mo может достигать 3 µБ. г) Наряду с этими вкладами необходимо учесть вероятность электронных конфигураций 3d7 и 3d8 для ионов Fe и Co соответственно, которые, по литературным данным, могут определять значения локальных атомных магнитных моментов до 6-7 µБ.

6. Были исследованы магнитные состояния ионов Fe и Co в МСР на основе Fe/Co/Mo методами ядерного гамма резонанса на ядрах , электронного спинового резонанса и температурной зависимости намагниченности. Было обнаружено, что в исследованных образцах ионы Fe и Со возможно находятся в высокоспиновых и низкоспиновых состояниях [Fe2+; Fe3+; Co2+; Co3+], по-видимому обусловленных существованием кластерных молекулярных комплексов типа , , , , n=4;6, которые могут обуславливать:

а) большие величины спонтанной намагниченности

б) большие величины эффективных констант анизотропии вследствие размораживания орбитальных моментов и больших величин спин-орбитального взаимодействия.

7. Магнитное поведение исследуемых образцов МСР на основе Fe/Co/Mo, полученных в разряде с осциллирующими электронами в атмосфере Kr, свидетельствует о том, что при комнатной температуре они ведут себя как молекулярные магниты.

Благодарности

Я выражаю глубокую благодарность научным руководителям профессору и доценту за постоянное внимание и руководство работой. Также большую благодарность за помощь в синтезировании образцов выражаю с. н.с. и ведущему инженеру

За большую помощь на отдельных этапах работы я благодарю доцента , , проф. , с. н.с. ,

Я глубоко благодарна руководству кафедры общей физики и физики конденсированного состояния МГУ физического факультета за предоставленную возможность обучения в МГУ и выполнения настоящей работы.

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