Electrical and thermal transport in van der Waals magnets <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>2</mml:mn><mml:mi mathvariant="normal">H</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mi mathvariant="normal">M</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>TaS</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mo> </mml:mo><mml:mo>(</mml:mo><mml:mi mathvariant="normal">M</mml:mi><mml:mo>=</mml:mo><mml:mi>Mn</mml:mi><mml:mo>,</mml:mo><mml:mo> </mml:mo><mml:mi>…

We report a detailed study of electrical and thermal transport properties in 2H-M$_x$TaS$_2$ (M = Mn, Co) magnets where M atoms are intercalated the van der Waals gap. The intercalation induces ferromagentism with an easy-plane anisotropy 2H-Mn$_x$TaS$_2$, but ferromagnetism strong uniaxial 2H-Co$_{0.22}$TaS$_2$, which finally evolves into three-dimensional antiferromagnetism 2H-Co$_{0.34}$TaS$_2$. Temperature-dependent resistivity shows metallic behavior for all samples. Thermopower is negative whole temperature range 2H-Co$_x$TaS$_2$, whereas sign changes from to positive increasing Mn 2H-Mn$_x$TaS$_2$. diffusive thermoelectric response dominates both high- low-temperature ranges A clear kink resistivity, weak anomaly conductivity, as well slope change thermopower were observed at magnetic transitions 2H-Mn$_{0.28}$TaS$_2$ ($T_\textrm{c}$ $\approx$ 82 K) 2H-Co$_{0.34}$TaS$_2$ ($T_\textrm{N}$ 36 K), respectively, albeit weaker lower $x$ crystals. Co-intercalation promoted ferromagnetic antiferromagnetic transition further confirmed by Hall resistivity; ordinary coefficient indicates multi-band 2H-Co$_x$TaS$_2$.