Giant Exchange Coupling Evidenced with a Magnetization Jump at 52 T for a Gadolinium-Nitroxide Chelate

Takuya Kanetomo; Takumi Kihara; Atsushi Miyake; Akira Matsuo; Masashi Tokunaga; Koichi Kindo; Hiroyuki Nojiri; Takayuki Ishida

doi:10.1021/acs.inorgchem.6b02685

Giant Exchange Coupling Evidenced with a Magnetization Jump at 52 T for a Gadolinium-Nitroxide Chelate

Inorg Chem. 2017 Mar 20;56(6):3310-3314. doi: 10.1021/acs.inorgchem.6b02685. Epub 2017 Mar 10.

Authors

Takuya Kanetomo¹, Takumi Kihara², Atsushi Miyake³, Akira Matsuo³, Masashi Tokunaga³, Koichi Kindo³, Hiroyuki Nojiri², Takayuki Ishida¹

Affiliations

¹ Department of Engineering Science, The University of Electro-Communications , Chofu, Tokyo 182-8585, Japan.
² Institute for Materials Research, Tohoku University , Sendai, Miyagi 980-8577, Japan.
³ Institute for Solid State Physics, The University of Tokyo , Kashiwa, Chiba 277-8581, Japan.

PMID: 28281348
DOI: 10.1021/acs.inorgchem.6b02685

Abstract

The Gd-radical complex [Gd^III(hfac)₃(6bpyNO)] (6bpyNO = 2,2'-bipyridin-6-yl tert-butyl nitroxide; Hhfac = 1,1,1,5,5,5-hexafluoropentane-2,4-dione) showed a magnetization jump at 52 T observed in a pulsed-field facility, corresponding to an exchange coupling constant of -17.4 K. Furthermore, hysteretic behavior due to a relatively slow magnetization reversal was recorded around 2 T. From the high-frequency EPR study, the exchange coupling between Gd and radical spins accompanies an anisotropic character, which is responsible for both the broad jump and the slow magnetization reversal.