Magnetic Hysteresis in Er Trimers on Cu(111)

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• 作者：Aparajita Singha ; Fabio Donati ; Christian Wäckerlin ; Romana Baltic ; Jan Dreiser ; Marina Pivetta ; Stefano Rusponi ; Harald Brune
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：June 8, 2016
• 年：2016
• 卷：16
• 期：6
• 页码：3475-3481
• 全文大小：518K
• 年卷期：0
• ISSN：1530-6992

文摘

We report magnetic hysteresis in Er clusters on Cu(111) starting from the size of three atoms. Combining X-ray magnetic circular dichroism, scanning tunneling microscopy, and mean-field nucleation theory, we determine the size-dependent magnetic properties of the Er clusters. Er atoms and dimers are paramagnetic, and their easy magnetization axes are oriented in-plane. In contrast, trimers and bigger clusters exhibit magnetic hysteresis at 2.5 K with a relaxation time of 2 min at 0.1 T and out-of-plane easy axis. This appearance of magnetic stability for trimers coincides with their enhanced structural stability.