We present a spin-exchange relaxation-free vector magnetometer with suppressed 1/f probe noise, achieved by applying a small dc bias field and a comb of magnetic dc π pulses along the pump direction. This results in a synchronous orthogonal ac response for each of its two sensitive axes. The magnetometer is particularly well suited to applications such as biomagnetism in which the signal to be measured carries a dominant component of its power at low frequencies. The magnetometer reaches a technical noise floor of 8 .4 fT Hz -1/2 ( x ^ ) and 11 fT Hz -1/2 ( y ^ ) at 0.01 Hz. A single-axis dc spin-exchange relaxation-free (SERF) magnetometer sharing the same experimental apparatus attains 61 fT Hz-1/2 at the same frequency. A noise minimum of 1 .1 fT Hz -1/2 ( x ^ ) and 2 .0 fT Hz -1/2 ( y ^ ) is reached by the magnetometer at10 Hz, compared to 0.7 fT Hz-1/2 at 25 Hz for a dc SERF magnetometer.