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- W4286588310 abstract "We have studied the magnetic properties of quasi two-dimensional itinerant ferromagnet Fe$_4$GeTe$_2$ as functions of temperature and magnetic field ($B$) with field parallel to the $ab$-plane ($B|ab$) and $c$-axis ($B|c$) of the crystal. This van der Waals compound undergoes a continuous paramagnetic to ferromagnetic phase transition below $T_C$ = 270.0 K and a pronounced spin reorientation transition at around $T_{SR}$ $sim$ 115 K where the easy axis of magnetization changes its direction from in-plane to out-of-plane. The temperature evolution of magnetization in the FM state is highly anomalous and extremely sensitive to the direction and strength of applied magnetic field. Magnetic entropy change ($Delta S_M$) has been estimated in the vicinity of $T_C$ and $T_{SR}$. $Delta S_M$($T$) is found to be almost isotropic around $T_C$ while it shows very unusual behavior and is sensitive to the direction of applied field at low temperature close to $T_{SR}$. For $B|c$, $Delta S_M$ is negative and decreases continuously with field and -$Delta S_M$($T$) shows a broad maximum around $T_{SR}$ similar to that observe at $T_C$. On the other hand, $Delta S_M$ is positive in the vicinity of $T_{SR}$ below 1.4 T and -$Delta S_M$($T$) exhibits a peak at $T_{SR}$ which becomes very sharp at high field for $B|ab$. These results suggest complex nature of the magnetic ground state of Fe$_4$GeTe$_2$, which is possibly due to the presence of multiple inequivalent Fe sites, their ordering and complexity of spin configuration." @default.
- W4286588310 created "2022-07-22" @default.
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- W4286588310 date "2022-07-20" @default.
- W4286588310 modified "2023-09-29" @default.
- W4286588310 title "Anomalous magnetic properties of quasi two-dimensional van der Waals ferromagnet Fe4GeTe2" @default.
- W4286588310 doi "https://doi.org/10.48550/arxiv.2207.09885" @default.
- W4286588310 hasPublicationYear "2022" @default.
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