How to shield magnetic field of one end of a permanent magnetic bar ?

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To achieve magnetic force on only one end of a magnetic bar while neutralizing the other end, attaching a large piece of iron to the non-magnetic end will not work as intended. The iron will absorb some magnetic flux, but it cannot eliminate the magnetic field entirely. According to Gauss' Law, all magnetic flux lines that exit one pole must enter the other pole, meaning that while field lines can be redirected, they cannot be completely contained or neutralized. Thus, the magnetic properties of the bar will remain intact, and the desired effect of having no magnetic force on one end cannot be achieved.
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I want magnetic force on one end of the magnetic bar only, but not on the other end. Will it work if I attach a big piece of iron on that end of magnetic bar which I do not want to have magnetic force? Imagine that big piece of iron will absorb all the magnetic flux from that end which i want it to be newtral ...
 
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You can redirect the field lines away from a region of interest, but that's about all you can do. You can not violate Gauss' Law. All the flux lines leaving one pole will have to enter the other pole.
 

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