"Isolated" DyO+ Embedded in a Ceramic Apatite Matrix Featuring Single‐Molecule Magnet Behavior with a High Energy Barrier for Magnetization Relaxation. Issue 43 (18th September 2017)

• Record Type: Journal Article
• Authors: Kazin, Pavel E.; Zykin, Mikhail A.; Utochnikova, Valentina V.; Magdysyuk, Oxana V.; Vasiliev, Alexander V.; Zubavichus, Yan V.; Schnelle, Walter; Felser, Claudia; Jansen, Martin
• Is Part Of: Angewandte Chemie international edition. Volume 56:Issue 43(2017)
• Page Start: 13416
• Page End: 13420
• Publication Date: 2017-09-18
• Subjects: apatite -- dysprosium -- luminescence -- magnetic properties -- single-molecule magnets; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201706391
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Meeting the challenges of Moore's Law, predicting ambitious miniaturization rates of integrated circuits, requires to go beyond the traditional top‐down approaches, and to employ synthetic chemistry methods, to use bottom‐up techniques. During the recent decades, it has been shown that open‐shell coordination compounds may exhibit intramolecular spontaneous magnetization, thus offering promising prospects for storage and processing of digital information. Against this background we regarded it rewarding to implement similar magnetic centers into a ceramic material, which would provide better long‐term mechanical and chemical durability. Here we present new robust inorganic compounds containing separate DyO + ions in an apatite matrix, which behave like single‐molecule magnets. The materials exhibit a blocking temperature of 11 K and an energy barrier for spin reversal of a thousand inverse centimeters which is among the highest values ever achieved. Abstract : Dy2 O3 ‐doped apatites show low‐temperature hysteresis magnetization with a blocking temperature of up to 11 K and slow relaxation of magnetization with an energy barrier ( U eff ) of up to 1043 cm −1 . The barrier was determined by an electron spin tunneling through the third and fourth excited Kramers doublet for calcium and strontium compounds, respectively.