The magnetic effect on the phase transitions of n-C22H46 (docosane) was measured using a high resolution and super-sensitive DSC. The surface freezing phenomenon was observed at about 3 K above the 'bulk' melting temperature in addition to solid-solid transitions and melting transition. The transition temperatures due to the solid-solid transitions and melting were shifted to higher temperatures by about 10 mK by applying magnetic field of 5T. On the other hand, the transition temperature due to surface freezing phenomenon was shifted to lower temperature by about 10 mK by applying magnetic field of 5T. The magnetic effects were discussed based on the extension of the Clapeyron equation. (C) 2013 Elsevier B.V. All rights reserved.