Observation of Excitation of the Antiferromagnetic Mode in the Paramagnetic State of(C2H5

H. G. Reimann

¹

,

Hans Hagen

²

,

F. Waldner

³

et al.

Observation of Additional FMR Resonances in a Two-Sublattice Ferromagnet

“…2). This is analogous to the intensity variation observed by Reimann et al [4] in the collapsed state of the AF system ( C~H S N H~)~ CuC14. The system for this work shows this intensity variation asse ciated with the resonance which is lower in field owing to the opposite sign of the exchange.…”

“…These systems are characterized by a strong intraplanar ferromagnetic exchange field (which determines T,) and a weaker inter-planar exchange which may be either ferromagnetic or antiferromagnetic (AF) [3]. Until now, resonance in the collapsed state corresponding to two-sublattice systems have been observed only in the AF compound (CZH~NH~), CuC14 [4]. In this paper we present a development of FMR in a uniaxial two-sublattice ferromagnet and give preliminary data which support the two-sublattice hypothesis in the layered ferromagnet [ N H~ (CH2)…”

Zeroth-Order Nucleation Transition under Nanoscale Phase Separation

“…Ferromagnetic cluster fluctuations, called ferrons or fluctuons, can arise inside a paramagnetic matrix of some semiconductors [40][41][42][43][44][45]. In some materials, magnetic cluster excitations can occur in the paramagnetic region above T c or above T N [46][47][48][49][50][51][52], causing the appearance of spin waves in the paramagnetic phase, for instance, in Ni, Fe, EuO, EuS, Pd 3 Fe, and Gd [53][54][55][56][57][58]. The coexistence of ferromagnetic and nonmagnetic phases was also observed in Y 2 Co 7 , YCo 3 , Co(S x Se 1−x ) 2 , Co(Ti x Al 1−x ) 2 , and Lu(Co 1−x Al x ) 2 [59,60].…”