Magnetic field induced first order antiferromagnetic (AFM) to ferrimagnetic (FRI) transition in polycrystalline Mn1.85Co0.15Sb has been studied using magnetic force microscopy (MFM) at 60 K and up to 8 T magnetic fields. Our MFM studies provide real space visualization of AFM to FRI transition. It shows growth (decay) of FRI phase with increasing (decreasing) magnetic field. The hysteretic behavior and coexisti ng FRI and AFM phases across the critical field required for FRI-AFM transition in Mn1.85Co0.15Sb are highlighted. This study demonstrates the potential of MFM for studying phase co-existence at high field and low temperatures. (C) 2009 Elsevier B.V. All rights reserved.