High density magnetic recording scheme

Claim 1

A method of high density magnetic recording by a single bipolar signal field HS using a magnetic recording head that includes a single drive conductor surrounded by a substantially closed flux path layer of magnetizable material having a recording gap therein that is oriented at an angle phi to the bipolar signal field HS which recording gap is inductively coupled to a relatively moving magnetizable recording medium that is of a thickness insufficient to support Bloch walls between adjacent domains and which recording medium has an easy axis that is parallel to the recording gap and that moves in a direction orthogonal thereto, the method comprising: generating a bipolar signal field HS by a current signal IS flowing through said drive conductor; aligning the magnetization of said magnetizable layer by and with said signal field HS; generating a bipolar gap field HG across said recording gap and in the recording medium by the magnetization of said magnetizable layer and the component of said signal field HS across said recording gap, which gap field is substantially orthogonal to said recording gap and is at an acute angle theta 90* - phi with respect to said signal field HS; generating a bipolar bias field HB along said recording gap and in the recording medium which bias field is the component of said signal field HS that is oriented substantially orthogonal to said gap field HG; generating a resultant field HR in said recording gap and in said recording medium which resultant field HR is the resultant of said orthogonal bias field HB and said gap field HG; rotating said resultant field HR in the same continuing direction upon the successive changes of polarity of said signal field HS for establishing in said recording medium interdomain Neel walls that are parallel to the recording medium''s easy axis and that rotate in the same magnetic sense in the plane of the recording medium.

Claim 2

A method of high density magnetic recording by a single bipolar signal field HS using a magnetic recording head that includes a single drive conductor surrounded by a substantially closed flux path layer of magnetizable material having a recording gap therein that is oriented at an angle phi to the bipolar signal field HS which recording gap is inductively coupled to a relatively moving magnetizable recording medium that is of a thickness insufficient to support Bloch walls between adjacent domains and which recording medium has an easy axis that is parallel to the recording gap and that moves in a direction orthogonal thereto, the method comprising: generating a bipolar signal field HS by a current signal IS flowing through said drive conductor; aligning the magnetization of said magnetizable layer by and with said signal field HS; generating a bipolar gap field HG across said recording gap and in the recording medium by the magnetization of said magnetizable layer and the component of said signal field HS across said recording gap, which gap field is substantially orthogonal to said recording gap and is at an acute angle theta 90* - phi with respect to said signal field HS; generating a bipolar bias field HB along said recording gap and in the recording medium which bias field is the component of said signal field HS that is oriented substantially orthogonal to said gap field HG; generating a resultant field HR in said recording gap and in said recording medium which resultant field HR is the resultant of said orthogonal bias field HB and said gap field HG; rotating said resultant field HR in the same continuing direction upon the successive changes of polarity of said signal field HS for establishing in said recording medium interdomain Neel walls that are parallel to the recording medium''s easy axis and that rotate in the same magnetic sense in the plane of the recording medium.