Minn. Stat. § 508A.54: MORTGAGE.

The owner of land registered under sections 508A.01 to 508A.85 may mortgage it by deed or other instrument sufficient in law for that purpose and the mortgage or other instrument may be assigned, extended, discharged, or released, either in whole or in part, or otherwise dealt with by the mortgagee by any form of deed or instrument sufficient in law for the purpose. The deed, mortgage, or other instrument, and all instruments assigning, extending, discharging, releasing, or otherwise dealing with the same, shall be registered and take effect upon the title only from the time of registration.