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Stage-2 CoCl$_{2}$ graphite intercalation compound undergoes two magneticphase transitions at $T_{cl}$ (= 7.0 K) and $T_{cu}$ (= 8.9 K). The agingdynamics of this compound is studied near $T_{cl}$ and $T_{cu}$. Theintermediate state between $T_{cl}$ and $T_{cu}$ is characterized by a spinglass phase extending over ferromagnetic islands. A genuine thermoremnantmagnetization (TRM) measurement indicates that the memory of the specific spinconfigurations imprinted at temperatures between $T_{cl}$ and $T_{cu}$ duringthe field-cooled (FC) aging protocol can be recalled when the system isre-heated at a constant heating rate. The zero-field cooled (ZFC) and TRMmagnetization is examined in a series of heating and reheating process. Themagnetization shows both characteristic memory and rejuvenation effects. Thetime $(t)$ dependence of the relaxation rate$S_{ZFC}(t)=(1/H)$d$M_{ZFC}(t)$/d$\ln t$ after the ZFC aging protocol with await time $t_{w}$, exhibits two peaks at characteristic times $t_{cr1}$ and$t_{cr2}$ between $T_{cl}$ and $T_{cu}$. An aging process is revealed as thestrong $t_{w}$ dependence of $t_{cr2}$. The observed aging and memory effect isdiscussed in terms of the droplet model.Comment: 14 pages, 16 figures; submitted to Phys. Rev.

physical review. b, condensed matter and materials physics

Memory and aging effect in hierarchical spin orderings of the stage-2<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Co</mml:mi><mml:msub><mml:mi mathvariant="normal">Cl</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>graphite intercalation compound

Memory and aging effect in hierarchical spin orderings of the stage-2CoCl2graphite intercalation compound