One-dimensional isolated Ni0.5Zn0.5Fe2O4 microtubes have been prepared via a template assisted sol–gel method. Temperature dependence of the structural and magnetic properties was studied via XRD, N2 adsorption, SEM, TEM, and VSM. An increase in calcination temperature from 873 to 1273K caused a decrease in the specific surface area from 80.7 to 17.0m2/g due to an increase of the grain size from 25.3 to 112nm. All samples demonstrated anomalous coercivity behavior due to mechanical stresses acting on their domain walls. The porous microtubes calcined at 1073K have a mean external diameter of 3.7μm with a length-to-diameter ratio exceeding 12. The microtubes calcined at 973K have the highest coercivity of 88.1Oe and demonstrated the largest specific heating rate of 4.36W/g in a radiofrequency field at 295kHz.